<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442011000400006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Pastas de Rhodomonas salina (Cryptophyta) como alimento para Brachionus plicatilis (Rotifera)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bastardo]]></surname>
<given-names><![CDATA[Leandro]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortez]]></surname>
<given-names><![CDATA[Roraysi]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arredondo-Vega]]></surname>
<given-names><![CDATA[Bertha]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Lolymar]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Concepción Centro de Biotecnología Facultad de Ciencias Naturales y Oceanográficas]]></institution>
<addr-line><![CDATA[Concepción ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Oriente Instituto Oceanográfico de Venezuela ]]></institution>
<addr-line><![CDATA[Cumaná ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Centro de Investigaciones Biológicas del Noroeste, S. C. (CIBNOR)  ]]></institution>
<addr-line><![CDATA[Baja California ]]></addr-line>
<country>México</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto Universitario de Tecnología  ]]></institution>
<addr-line><![CDATA[Cumaná ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>59</volume>
<numero>4</numero>
<fpage>1503</fpage>
<lpage>1515</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442011000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442011000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442011000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Rhodomonas salina (Cryptophyta) pastes as feed for Brachionus plicatilis (Rotifera). Rotifers are an important live feed for first feeding larvae of many fish species. The use of concentrated algae cells in the mass culture of the rotifer Brachionus plicatilis (Brachionidae) has opened new horizons for research on this organism. Pastes of Rhodomonas salina (Pyrenomonadaceae) obtained either by centrifugation or flocculation with chitosan were preserved, with or without vitamin C, at -20°C for four weeks and were evaluated biochemically (proteins, lipids, pigments and fatty acids contents) and subsequently, were used to feed the rotifer Brachionus plicatilis at a ratio of 25mg/L/day. Four different microalgae pastes were prepared: (1) centrifuged and preserved with vitamin C (CV), (2) centrifuged and preserved without vitamin C (C), (3) flocculated and with vitamin C (FV) and (4) flocculated without vitamin C (F). All treatments showed similar contents of proteins and total lipids with respect to control culture (a fresh culture of R. salina), with mean values of 40.0±2.32% and 12.0±1.45%, respectively. The pheophytin a/chlorophyll a ratio, a general indicator of the chemical status of microalgal concentrates, was similar (0.09-0.11) between centrifuged pastes and control culture, but was found to be higher in flocculated pastes (1.28-1.48). The fatty acid profile varied with respect to the control culture, mainly in the proportion of the essential polyunsaturated fatty acids (PUFAs): eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Total PUFAs, EPA and DHA contents were statistically similar between centrifuged pastes and control culture (PUFAs: 47%, EPA: 4% and DHA: 4.7%), whereas values obtained for flocculated pastes were significantly lower. The rotifers grew equally well when fed with centrifuged pastes or control culture (maximum density: 320rotifers/mL; instantaneous growth rate: 0.23rotifers/day, fecundity: 1.49eggs/female and productivity: 43x103rotifers/L/day. No significant effect of vitamin C was found when used as a paste preservative. We concluded that centrifugation is an effective harvesting method, and that freezing to -20ºC for four weeks (no vitamin added), may help maintain the nutritional quality of R. salina paste, similar to fresh microalgae and can be offered to Brachionus plicatilis. Rev. Biol. Trop. 59 (4): 1503-1515. Epub 2011 December 01.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Pastas de Rhodomonas salina, obtenidas mediante centrifugación y floculación con quitosano y preservadas con o sin vitamina C, a -20°C fueron evaluadas bioquímicamente y proporcionadas como alimento al rotífero Brachionus plicatilis. Las pastas microalgales: (1) centrifugada y con vitamina C (CV), (2) centrifugada y sin vitamina C (C), (3) floculada y con vitamina C (FV) y (4) floculada y sin adición de vitamina C (F); mantuvieron sus contenidos de proteínas y lípidos totales similares al cultivo control, con valores de 40.0±2.32% y 12.0±1.45%, respectivamente. La relación feofitina a/clorofila a fue similar (0.09-0.11) entre las pastas centrifugadas y el cultivo control, pero mayor en las pastas floculadas (1.28-1.48). Las pastas centrifugadas presentaron porcentajes de PUFAs totales, EPA y DHA similares al cultivo control (PUFAs: 47%, EPA: 4% y DHA: 4.7%) y superiores al de las pastas floculadas. Las pastas obtenidas por centrifugación indujeron un crecimiento del rotífero igual al obtenido con el alimento control (densidad máxima: 320rotíferos/mL; tasa instantánea de crecimiento: 0.23rotíferos/día, fecundidad: 1.49huevos/ hembra y productividad: 43x103rotíferos/L/día). Se concluye que la pasta de R. salina centrifugada y congelada a -20°C, durante cuatro semanas, sin adición de vitamina C, mantiene su calidad nutricional similar a la del alga fresca y puede ser usada como alimento de Brachionus plicatilis.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[microalgae paste]]></kwd>
<kwd lng="en"><![CDATA[aquaculture]]></kwd>
<kwd lng="la"><![CDATA[Rhodomonas salina]]></kwd>
<kwd lng="en"><![CDATA[flocculation]]></kwd>
<kwd lng="en"><![CDATA[rotifers]]></kwd>
<kwd lng="es"><![CDATA[pasta de microalgas]]></kwd>
<kwd lng="es"><![CDATA[acuicultura]]></kwd>
<kwd lng="la"><![CDATA[Rhodomonas salina]]></kwd>
<kwd lng="es"><![CDATA[floculación]]></kwd>
<kwd lng="es"><![CDATA[rotíferos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font size="+1"><b><font face="Verdana">Pastas de </font></b></font><font  face="Verdana" size="+1"><i>Rhodomonas salina </i><b>(Cryptophyta) como alimento para </b><i>Brachionus plicatilis </i><b>(Rotifera)</b></font></p> <b><font size="2"> </font></b>     <p align="justify"><font face="Verdana" size="2">Miguel Guevara<sup><a  href="#autor_1">1</a>,<a href="#autor2">2</a></sup>, Leandro Bastardo<a href="#autor2"><sup>2</sup></a>, Roraysi Cortez<a  href="#autor2"><sup>2</sup></a>, Bertha Arredondo-Vega<a href="#autor3"><sup>3</sup></a>, Lolymar Romero<a  href="#autor4"><sup>4</sup></a> &amp; Patricia G&oacute;mez<a href="#autor_1"><sup>1</sup></a></font></p> <font face="Verdana" size="2"><a name="autor_1"></a>1. Departamento de Bot&aacute;nica, Facultad de Ciencias Naturales y Oceanogr&aacute;ficas, Centro de Biotecnolog&iacute;a, Universidad de Concepci&oacute;n, Casilla 160-C, Concepci&oacute;n, Chile; <a href="mailto:miguevara2003@yahoo.es">miguevara2003@yahoo.es</a>, <a href="mailto:pgomez@udec.cl">pgomez@udec.cl</a>    <br> <a name="autor2"></a>2. Instituto Oceanogr&aacute;fico de Venezuela, Universidad de Oriente, Apartado 6101, Cuman&aacute;, Venezuela; <a href="mailto:l.bastardo@hotmail.com">l.bastardo@hotmail.com</a>, <a href="mailto:roraysi@yahoo.com">roraysi@yahoo.com</a></font> <font face="Verdana" size="2">    <br> <a name="autor3"></a>3. Centro de Investigaciones Biol&oacute;gicas del Noroeste, S. C. (CIBNOR), Baja California, M&eacute;xico; </font><a href="mailto:kitty04@cibnor.mx"><font  face="Verdana" size="2">kitty04@cibnor.mx</font></a><span  style="font-family: verdana;"><span style="text-decoration: underline;">    <br> </span></span><font face="Verdana" size="2"><a name="autor4"></a>4. Instituto Universitario de Tecnolog&iacute;a, Apartado 6101, Cuman&aacute;, Venezuela; </font><font face="Verdana" size="2"><a  href="mailto:lolyrome@yahoo.com">lolyrome@yahoo.com</a>    <br> </font>     <p align="justify"><font face="Verdana" size="2"><a  href="#Correspondencia">Direcci&oacute;n para correspondencia</a>     <br> </font></p> <font size="2"> </font> <hr style="width: 100%; height: 2px;">     <p align="justify"><b><font face="Verdana" size="3">Abstract</font></b></p>     <p style="text-align: justify;"><font face="Verdana" size="2"><i>Rhodomonas salina </i><b>(Cryptophyta) pastes as feed for </b><i>Brachionus plicatilis </i><b>(Rotifera)</b>. Rotifers are an important live feed for first feeding larvae of many fish species. The use of concentrated algae cells in the mass culture of the rotifer <i>Brachionus plicatilis </i>(Brachionidae) has opened new horizons for research on this organism. Pastes of <i>Rhodomonas salina </i>(Pyrenomonadaceae) obtained either by centrifugation or flocculation with chitosan were preserved, with or without vitamin C, at -20&deg;C for four weeks and were evaluated biochemically (proteins, lipids, pigments and fatty acids contents) and subsequently, were used to feed the rotifer <i>Brachionus plicatilis </i>at a ratio of 25mg/L/day. Four different microalgae pastes were prepared: (1) centrifuged and preserved with vitamin C (CV), (2) centrifuged and preserved without vitamin C (C), (3) flocculated and with vitamin C (FV) and (4) flocculated without vitamin C (F). All treatments showed similar contents of proteins and total lipids with respect to control culture (a fresh culture of <i>R. salina</i>), with mean values of 40.0&plusmn;2.32% and 12.0&plusmn;1.45%, respectively. The pheophytin <i>a</i>/chlorophyll <i>a </i>ratio, a general indicator of the chemical status of microalgal concentrates, was similar (0.09-0.11) between centrifuged pastes and control culture, but was found to be higher in flocculated pastes (1.28-1.48)<i>. </i>The fatty acid profile varied with respect to the control culture, mainly in the proportion of the essential polyunsaturated fatty acids (PUFAs): eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Total PUFAs, EPA and DHA contents were statistically similar between centrifuged pastes and control culture (PUFAs: 47%, EPA: 4% and DHA: 4.7%), whereas values obtained for flocculated pastes were significantly lower. The rotifers grew equally well when fed with centrifuged pastes or control culture (maximum density: 320rotifers/mL; instantaneous growth rate: 0.23rotifers/day, fecundity: 1.49eggs/female and productivity: 43x103rotifers/L/day. No significant effect of vitamin C was found when used as a paste preservative. We concluded that centrifugation is an effective harvesting method, and that freezing to -20&ordm;C for four weeks (no vitamin added), may help maintain the nutritional quality of <i>R. salina </i>paste, similar to fresh microalgae and can be offered to <i>Brachionus plicatilis</i>. Rev. Biol. Trop. 59 (4): 1503-1515. Epub 2011 December 01.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2"><b>Key words: </b>microalgae paste, aquaculture, <i>Rhodomonas salina, </i>flocculation, rotifers.</font></p> <font face="Verdana" size="3"><b>     <p align="justify">Resumen</p> </b></font><font size="2"> </font>     <p style="text-align: justify;"><font face="Verdana" size="2">Pastas de <i>Rhodomonas salina, </i>obtenidas mediante centrifugaci&oacute;n y floculaci&oacute;n con quitosano y preservadas con o sin vitamina C, a -20&deg;C fueron evaluadas bioqu&iacute;micamente y proporcionadas como alimento al rot&iacute;fero <i>Brachionus plicatilis</i>. Las pastas microalgales: (1) centrifugada y con vitamina C (CV), (2) centrifugada y sin vitamina C (C), (3) floculada y con vitamina C (FV) y (4) floculada y sin adici&oacute;n de vitamina C (F); mantuvieron sus contenidos de prote&iacute;nas y l&iacute;pidos totales similares al cultivo control, con valores de 40.0&plusmn;2.32% y 12.0&plusmn;1.45%, respectivamente. La relaci&oacute;n feofitina <i>a</i>/clorofila <i>a </i>fue similar (0.09-0.11) entre las pastas centrifugadas y el cultivo control, pero mayor en las pastas floculadas (1.28-1.48)<i>. </i>Las pastas centrifugadas presentaron porcentajes de PUFAs totales, EPA y DHA similares al cultivo control (PUFAs: 47%, EPA: 4% y DHA: 4.7%) y superiores al de las pastas floculadas. Las pastas obtenidas por centrifugaci&oacute;n indujeron un crecimiento del rot&iacute;fero igual al obtenido con el alimento control (densidad m&aacute;xima: 320rot&iacute;feros/mL; tasa instant&aacute;nea de crecimiento: 0.23rot&iacute;feros/d&iacute;a, fecundidad: 1.49huevos/ hembra y productividad: 43x103rot&iacute;feros/L/d&iacute;a). Se concluye que la pasta de <i>R. salina </i>centrifugada y congelada a -20&deg;C, durante cuatro semanas, sin adici&oacute;n de vitamina C, mantiene su calidad nutricional similar a la del alga fresca y puede ser usada como alimento de <i>Brachionus plicatilis</i>.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Palabras clave: </b>pasta de microalgas, acuicultura, <i>Rhodomonas salina</i>, floculaci&oacute;n, rot&iacute;feros.</font></p> <hr style="width: 100%; height: 2px;">     <p style="text-align: justify;"><font face="Verdana" size="2">La producci&oacute;n de microalgas en las salas de cr&iacute;a tiene como objetivo proveer de alimento vivo, de excelente calidad nutricional, a especies animales en cultivo, especialmente larvas y juveniles de moluscos bivalvos y camarones peneidos (Brown &amp; Robert 2002). Esta actividad presenta un elevado costo de producci&oacute;n, el cual puede variar entre 50 y 200$/ kg de biomasa seca de microalga, lo que puede representar entre el 20 y el 50% de los costos de operaci&oacute;n de una sala de cr&iacute;a (Borowitzka 1997). Una alternativa a este problema es el uso de biomasa microalgal preservada en forma de pastas, ya que &eacute;sta podr&iacute;a reducir los costos de producci&oacute;n y, adem&aacute;s, disminuir la dependencia del alimento vivo en los periodos donde las variaciones estacionales limitan su producci&oacute;n (Heasman <i>et al</i>. 2000).</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2">La centrifugaci&oacute;n es el m&eacute;todo m&aacute;s usado para obtener concentrados microalgales; mientras que la floculaci&oacute;n, un m&eacute;todo ampliamente usado en la industria para remover s&oacute;lidos en suspensi&oacute;n, tambi&eacute;n ha sido exitosamente aplicado a la cosecha de biomasa microalgal (Molina-Grima <i>et al</i>. 2003). Los concentrados de microalgas producidos por centrifugaci&oacute;n o floculaci&oacute;n y mantenidos refrigerados entre 2 y 4&deg;C por una a ocho semanas, se han usado exitosamente en la alimentaci&oacute;n de larvas y juveniles de bivalvos (Bonaldo <i>et al</i>. 2005). Nell &amp; O&#8217;Connor (1991) encontraron que las larvas de <i>Saccostrea glomerata </i>mostraron un crecimiento equivalente al ser alimentadas con <i>Pavlova lutheri </i>e <i>Isochrysis galbana</i>, tanto en forma de dieta viva o como pasta. Resultados similares fueron obtenidos por Brown &amp; Robert (2002) en larvas y j&oacute;venes de <i>Crassostrea gigas, </i>alimentadas con pastas floculadas de <i>Chaetoceros calcitrans</i>. A pesar de que las pastas preservadas de microalgas constituyen un alimento de bajo costo (Concei&ccedil;&atilde;o <i>et al</i>. 2010), f&aacute;cil obtenci&oacute;n (Bonaldo <i>et al</i>. 2005) y transporte, hay que tener en consideraci&oacute;n que la preservaci&oacute;n en el tiempo de su calidad nutricional es espec&iacute;fica-especie, dadas las variadas caracter&iacute;sticas morfo-estructurales de la pared celular de las microalgas (Ponis <i>et al</i>. 2008). Es as&iacute;, por ejemplo, como los concentrados unialgales de <i>Chaetoceros calcitrans</i>, <i>Skeletonema costatum </i>y <i>Tetraselmis </i>spp. que se mantienen bajo refrigeraci&oacute;n conservan su composici&oacute;n bioqu&iacute;mica hasta por un periodo de dos meses (Heasman <i>et al</i>. 2000); mientras que la biomasa de <i>Isochrysis </i>sp. (TISO) y <i>Pavlova lutheri, </i>se deteriora con mayor facilidad (Molina-Grima <i>et al</i>. 1994, McCausland <i>et al</i>. 1999). Entre los m&eacute;todos utilizados para preservar la calidad nutricional de las pastas microalgales est&aacute;n: la aplicaci&oacute;n de antioxidantes (Molina-Grima <i>et al</i>. 1994, Heasman <i>et al. </i>2000, Tzovenis <i>et al</i>. 2004), control de luz (Montaini <i>et al</i>. 1995, Chini Zittelli <i>et al</i>. 2003), liofilizaci&oacute;n (Albentosa <i>et al</i>. 1997), temperatura (McCausland <i>et al</i>. 1999), aireaci&oacute;n (Ponis <i>et al</i>. 2008), congelaci&oacute;n (Lubzens <i>et al</i>. 1995) y refrigeraci&oacute;n (Robert <i>et al</i>. 2001, Nunes <i>et al</i>. 2009).</font> </div>     <p style="text-align: justify;"><font face="Verdana" size="2">Las cript&oacute;fitas han sido poco utilizadas para producir concentrados algales, a pesar de su excelente calidad nutricional y facilidad de cultivo (Renaud <i>et al</i>. 2002, Berm&uacute;dez <i>et al</i>. 2004). <i>Rhodomonas salina </i>(Wislouch) Hill &amp; Wetherbee (1989) es la cript&oacute;fita que m&aacute;s se ha utilizado en acuicultura debido, principalmente, a su alto contenido de prote&iacute;nas, l&iacute;pidos y &aacute;cidos grasos poliinsaturados (Fern&aacute;ndez <i>et al</i>. 1989, Zhukova &amp; Aizdaicher 1995, Dunstan <i>et al</i>. 2005). Su valor nutricional explica su capacidad para incrementar la tasa de supervivencia del pect&iacute;nido <i>Pecten maximus </i>(Tremblay <i>et al</i>. 2007) y la tasa de crecimiento instant&aacute;nea de juveniles de <i>Crassostrea gigas </i>(MCCausland <i>et al</i>. 1999). Por eso uno de los objetivos de este estudio fue evaluar la composici&oacute;n bioqu&iacute;mica de pastas obtenidas a partir de una cepa de <i>Rhodomonas salina, </i>mediante el uso de distintos m&eacute;todos de cosecha y preservaci&oacute;n del concentrado microalgal.</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2">El rot&iacute;fero <i>Brachionus plicatilis </i>(M&uuml;ller) es usado ampliamente en acuicultura como veh&iacute;culo para proporcionar nutrientes esenciales a especies animales en cultivo. Entre sus caracter&iacute;sticas destacan su tama&ntilde;o microsc&oacute;pico (130-300</font><font face="Verdana" size="2">&#956;m), movimiento lento en el agua,</font><font face="Verdana" size="2"> f&aacute;cil y econ&oacute;mica alimentaci&oacute;n con diferentes especies de fitoplancton y/o levadura, a parte de su tasa alta de reproducci&oacute;n (James <i>et al</i>. 1983). El cultivo de <i>B. plicatilis </i>data desde 1960 y, a partir de esa fecha, se ha venido empleando en la larvicultura de diversas especies de peces (Theilacker &amp; McMaster 1971, Opstad <i>et al</i>. 1985, Lubzens <i>et al</i>. 1989, Cavalin &amp; Weirich 2009) y crust&aacute;ceos (Liao <i>et al</i>. 1983, Alvarez &amp; Ewald 1990).    <br>     <br> </font></div>     ]]></body>
<body><![CDATA[<div style="text-align: justify;"><font face="Verdana" size="2"><i>Brachionus plicatilis </i>ha sido alimentado exitosamente con diferentes microalgas, ya sea en forma fresca o como pasta congelada (Lubzens <i>et al</i>. 1995), polvo seco (Robert &amp; Trintignac 1997) y polvo liofilizado (Y&uacute;fera &amp; Navarro 1995, Navarro &amp; Sarasquete 1998); siendo las pastas congeladas una de las mejores fuentes de nutrientes para estos organismos (Lubzens <i>et al</i>.1995, Gallagher <i>et al</i>. 2001). El uso de pastas de <i>R. salina </i>para la alimentaci&oacute;n del rot&iacute;fero <i>Brachionus plicatilis </i>no est&aacute; documentado, por lo cual esta investigaci&oacute;n plante&oacute; la evaluaci&oacute;n de este tipo pasta como alimento de este importante microinvertebrado.</font> </div>     <div style="text-align: justify;"><font face="Verdana" size="3"><b>     <p align="justify">Materiales y m&eacute;todos</p> </b></font> </div>     <div style="text-align: justify;"> </div>     <p style="text-align: justify;"><b><font face="Verdana" size="2">Cepa de microalga y del rot&iacute;fero: </font></b><font face="Verdana" size="2">La cepa CS174 de <i>Rhodomonas salina </i>(Wislouch) Hill &amp; Wetherbee (1989) fue obtenida del Cepario CSIRO Algal Culture Collection, CSIRO Division of Marine Research, Hobart, Tasmania. La cepa de <i>Brachionus plicatilis </i>fue aislada de las salinas de Araya, Venezuela (10&ordm;30&#8217;-10&ordm;40&#8217;&#8217; N - 63&ordm;32&#8217;-64&ordm;21&#8217;&#8217; W). Ambos organismos est&aacute;n depositados en la colecci&oacute;n de cultivos planct&oacute;nicos del Laboratorio de Acuicultura, extensi&oacute;n Plancton del Departamento de Biolog&iacute;a Pesquera, del Instituto Oceanogr&aacute;fico de Venezuela, Universidad de Oriente.</font></p>     <div style="text-align: justify;"> </div>     <p style="text-align: justify;"><font face="Verdana" size="2"><b>Condiciones del cultivo de la microalga: </b>Un cultivo de <i>R. salina </i>en fase de crecimiento exponencial, aclimatado durante tres generaciones (K=0.9div/d&iacute;a) a luz continua (100</font><font face="Verdana"  size="2">&#956;mol/m2/s de irradianza), 29&plusmn;1&#906;</font><font face="Verdana" size="2">C y pH entre 7.5-8.5 se us&oacute; para inocular 13L de medio fresco contenidos en botellones de vidrio de 15L, provistos de aireaci&oacute;n constante (200mL/ min). Estos nuevos cultivos se realizaron por cuadruplicado con una densidad inicial de 1x105cel/mL, en medio f/2 (Guillard 1975) con una concentraci&oacute;n de nitrato y fosfato de 3.5mM y 0.018mM, respectivamente, utilizando agua de mar (37UPS) filtrada y esterilizada en autoclave (15psi/120&deg;C/15 min).</font></p>     <div style="text-align: justify;"> </div>     <p style="text-align: justify;"><font face="Verdana" size="2"><b>Producci&oacute;n de pastas algales de <i>Rhodomonas salina: </i></b>Cuando los cultivos alcanzaron la fase de crecimiento exponencial tard&iacute;a (6to d&iacute;a), se procedi&oacute; a realizar la cosecha total, para lo cual se evaluaron dos m&eacute;todos: (a).-Centrifugaci&oacute;n: consisti&oacute; en centrifugar 6L de cultivo, de cada r&eacute;plica, a 3 000rpm/5min, usando tubos c&oacute;nicos de 15mL de capacidad. (b).- Floculaci&oacute;n: se bas&oacute; en agregar al cultivo (6L de cada r&eacute;plica) una soluci&oacute;n de quitosano en &aacute;cido ac&eacute;tico (7.5g de quitosano/500mL de &aacute;cido ac&eacute;tico al 20%), al cual se le subi&oacute; previamente el pH hasta 10 con NaOH 1mol/L. La adici&oacute;n de la soluci&oacute;n de quitosano fue hasta que el pH se estabiliz&oacute; entre 7 y 8. A continuaci&oacute;n se agit&oacute; y dej&oacute; en reposo para propiciar la floculaci&oacute;n (Morales <i>et al</i>. 1985).</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Las pastas algales (obtenidas por centrifugaci&oacute;n y floculaci&oacute;n) fueron divididas en dos partes cada una y a una de las partes se le agreg&oacute; 0.1% m/m de vitamina C (&aacute;cido asc&oacute;rbico) con la finalidad de evaluar su utilidad como antioxidante (Nunes <i>et al</i>. 2009). Posteriormente, todas las pastas fueron almacenadas durante cuatro semanas a -20&ordm;C en oscuridad. De esta forma, quedaron constituidas cuatro tipos de pastas algales: (1) centrifugada y con vitamina C (CV), (2) centrifugada y sin vitamina C (C), (3) floculada y con vitamina C (FV) y (4) floculada y sin adici&oacute;n de vitamina C (F).</font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify;"><font face="Verdana" size="2">Despu&eacute;s de cuatro semanas de almacenamiento, se pes&oacute; 1g de cada pasta microalgal y se resuspendi&oacute; en 49mL de agua de mar filtrada y esterilizada. A partir de esta resuspensi&oacute;n se determin&oacute; la concentraci&oacute;n de prote&iacute;nas totales (Lowry <i>et al</i>. 1951), l&iacute;pidos totales (Marsh &amp; Weinstein 1966), &aacute;cidos grasos (Sato &amp; Murata 1988), clorofila <i>a, </i>feofitina <i>a </i>y relaci&oacute;n feofitina <i>a</i>/clorofila <i>a </i>(Lorenzen 1967). Los cultivos frescos de <i>R. salina</i>, se realizaron por cuadruplicado en similares condiciones, fueron analizados bioqu&iacute;micamente y se usaron como controles.</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2"><b>Ensayos de alimentaci&oacute;n del rot&iacute;fero <i>B. plicatilis </i>con pastas algales: </b>Los cultivos de <i>B. plicatilis </i>se realizaron, por cuadruplicado, en matraces de 500ml de capacidad con 250ml de agua de mar (37UPS) filtrada a trav&eacute;s de una bater&iacute;a de filtros: 10; 5; 1; 0.1</font><font face="Verdana"  size="2">&#956;m y esterilizada</font><font face="Verdana" size="2"> mediante tratamiento con luz UV. Los cultivos se iniciaron con una densidad de 100rot&iacute;feros/ mL y se mantuvieron con aireaci&oacute;n continua (50mL/min). Diariamente, se les proporcion&oacute;, por separado, 25mg/L de cada pasta de <i>R. salina</i>, previamente resuspendidas en agua de mar (Navarro &amp; Y&uacute;fera (1998). Paralelamente, en similares condiciones, se realizaron cultivos de <i>B. plicatilis </i>y se alimentaron con cultivos frescos de <i>Rhodomonas salina </i>(raci&oacute;n equivalente a 25mg/L/d&iacute;a).</font> </div>     <p style="text-align: justify;"><font face="Verdana" size="2">Diariamente, se determin&oacute; la densidad de rot&iacute;feros. Cuando los cultivos mostraron sus mayores valores de densidad poblacional se procedi&oacute; a calcular la tasa instant&aacute;nea de crecimiento, la fecundidad (n&uacute;mero de huevos/hembra) y productividad (rot&iacute;feros/L/d&iacute;a) seg&uacute;n Navarro &amp; Y&uacute;fera (1998).</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Los resultados de las evaluaciones bioqu&iacute;micas de las pastas microalgales, as&iacute; como los datos de crecimiento, productividad y fecundidad de los rot&iacute;feros se compararon mediante an&aacute;lisis de varianza (ANOVA) de una v&iacute;a, utilizando el programa estad&iacute;stico Statistix V.1.0, previo cumplimiento de los supuestos de: normalidad del error (prueba de Wilk-Sahpiro), homogeneidad de las varianzas (prueba de Bartlett) y aditividad de los efectos (prueba de Tukey). Los datos que mostraron diferencias significativas (p&lt;0.05) se les aplic&oacute; la prueba de Dunnet, con el fin de establecer diferencias grupales, siguiendo las recomendaciones de Zar (1984).</font></p> <font face="Verdana" size="3"><b>     <p align="justify">Resultados</p> </b></font><font size="2"> </font>     <p style="text-align: justify;"><b><font face="Verdana" size="2">Contenido de prote&iacute;nas y l&iacute;pidos totales: </font></b><font  face="Verdana" size="2">Los contenidos de prote&iacute;nas y l&iacute;pidos totales de las diferentes pastas (% con base a masa seca) no mostraron diferencias significativas (Dunnet, p&gt;0.05) ni entre ellas ni con respecto al cultivo fresco (<a  href="/img/revistas/rbt/v59n4/a06i1.jpg">Fig. 1</a>). Los valores promedio (media&plusmn;desviaci&oacute;n est&aacute;ndar) para estos par&aacute;metros fueron 40.0&plusmn;2.3% de prote&iacute;nas y 12.0&plusmn;1.4% de l&iacute;pidos.</font></p>     <div style="text-align: justify;"> </div>     <p style="text-align: justify;"><font face="Verdana" size="2"><b>Perfil de &aacute;cidos grasos: </b>El perfil de &aacute;cidos grasos de las cuatro pastas de <i>R. salina </i>(FV, F, CV y C), almacenadas durante cuatro semanas a -20&deg;C present&oacute; pocas variaciones con respecto al control (cultivo fresco) (<a href="/img/revistas/rbt/v59n4/a06t1.gif">Cuadro 1</a>). Las mayores variaciones se observaron en el contenido total de los &aacute;cidos grasos poliinsaturados (PUFAs), los cuales mostraron diferencias significativas entre las diferentes pastas (Dunnet, p&lt;0.05). </font></p>     <div style="text-align: justify;"><font face="Verdana" size="2">Las pastas centrifugadas (CV y C) presentaron porcentajes de PUFAs totales similares al control (47%), valor que fue significativamente superior (Dunnet, p&lt;0.05) al obtenido en las pastas floculadas (FV y F) (43%). En el caso de los &aacute;cidos grasos esenciales EPA y DHA, se obtuvieron diferencias significativas (Dunnet, p&lt;0.05) entre las distintas pastas microalgales. En las pastas centrifugadas, los porcentajes de estos &aacute;cidos grasos resultaron estad&iacute;sticamente similares a los obtenidos en el cultivo control (EPA, 4% y DHA, 4.7%), valores que</font>    <br> <font face="Verdana" size="2">disminuyeron significativamente en las pastas floculadas con quitosano (EPA, 3.1% y DHA, 3.4%) (<a href="/img/revistas/rbt/v59n4/a06t1.gif">Cuadro 1</a>).</font> </div>     ]]></body>
<body><![CDATA[<div style="text-align: justify;"> </div>     <p style="text-align: justify;"><font face="Verdana" size="2"><b>Relaci&oacute;n feofitina <i>a</i>/clorofila <i>a</i>: </b>La relaci&oacute;n feofitina <i>a</i>/clorofila <i>a </i>mostr&oacute; diferencias significativas entre las pastas centrifugadas y floculadas (Dunnet, p&lt;0.05). Como se observa en la Fig. 2 la relaci&oacute;n feofitina <i>a</i>/clorofila <i>a </i>de las pastas obtenidas por centrifugaci&oacute;n vari&oacute; entre 0.09 y 0.11; valores muy bajos y similares al obtenido para el cultivo control (Dunnet, p&gt;0.05). Por el contrario, las pastas obtenidas por floculaci&oacute;n con quitosano presentaron valores mucho m&aacute;s elevados (1.25 a 1.45), sin diferencias significativas entre ellos (Dunnet, p&gt;0.05), lo que muestra que la adici&oacute;n de vitamina C a las pastas no evit&oacute; la degradaci&oacute;n de la clorofila <i>a </i>durante el tiempo de almacenamiento.</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2"><b>Par&aacute;metros de crecimiento de <i>B. plicatilis</i>: </b>Los valores mayores de densidad poblacional, tasa instant&aacute;nea de crecimiento, productividad y fecundidad al quinto d&iacute;a de cultivo variaron entre 316-326 rot&iacute;feros/ mL; 0.23-0.24rot&iacute;feros/d&iacute;a; 40 590-45 120rot&iacute;feros/L/d&iacute;a y 1.46-1.52huevos/hembra, respectivamente (<a href="/img/revistas/rbt/v59n4/a06i3.jpg">Fig. 3</a>, <a  href="/img/revistas/rbt/v59n4/a06t2.gif">Cuadro 2</a>). Posterior al quinto d&iacute;a de cultivo, se observ&oacute; deterioro en todos los cultivos de rot&iacute;feros, manifestado por la aparici&oacute;n de olores desagradables y abundancia de espuma en la superficie de los mismos. Los par&aacute;metros de crecimiento y fecundidad de <i>B. plicatilis </i>al quinto d&iacute;a de alimentaci&oacute;n con las pastas microalgales generadas </font><font face="Verdana" size="2">por centrifugaci&oacute;n (CV y C), no mostraron diferencias significativas (Dunnet, p&gt;0.05) con respecto a los par&aacute;metros de los individuos cultivados con el alimento control (cultivo fresco). Por otro lado, los rot&iacute;feros alimentados con las pastas obtenidas por floculaci&oacute;n (FV y F) mostraron par&aacute;metros de crecimiento y fecundidad significativamente inferiores (Dunnet, p&lt;0.05) (<a href="/img/revistas/rbt/v59n4/a06i3.jpg">Fig. 3</a>, <a  href="/img/revistas/rbt/v59n4/a06t2.gif">Cuadro 2</a>).</font> </div>     <div style="text-align: justify;"><font face="Verdana" size="3"><b>     <p align="justify">Discusi&oacute;n</p> </b></font><font size="2"> </font></div>     <p style="text-align: justify;"><font face="Verdana" size="2">Este estudio demuestra la factibilidad de usar pastas de <i>Rhodomonas salina </i>como alimento para <i>B. plicatilis</i>, un rot&iacute;fero ampliamente utilizado en acuicultura como veh&iacute;culo marinas en cultivo (Lubzens <i>et al</i>. 2001). La centrifugaci&oacute;n o floculaci&oacute;n no afect&oacute; la composici&oacute;n de prote&iacute;nas y l&iacute;pidos de las pastas, as&iacute; como tampoco las afect&oacute; el almacenamiento a -20&ordm;C por 4 semanas.</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Por otro lado, las pastas obtenidas por centrifugaci&oacute;n conservaron la proporci&oacute;n de PUFAs esenciales, EPA y DHA similares al cultivo fresco y produjeron mayor crecimiento y fecundidad de <i>B</i>. <i>plicatilis</i>, que las pastas obtenidas por floculaci&oacute;n con quitosano (<a  href="/img/revistas/rbt/v59n4/a06t1.gif">Cuadro </a><a  href="/img/revistas/rbt/v59n4/a06t1.gif">1</a>, <a  href="/img/revistas/rbt/v59n4/a06t2.gif">2</a>, <a  href="/img/revistas/rbt/v59n4/a06i3.jpg">Fig. 3</a>). Este &uacute;ltimo hallazgo respalda un hecho que ha sido previamente destacado para numerosas especies (Levine &amp; Sulkin 1984, Pernet &amp; Tremblay 2004): la importancia de los PUFAs como nutrientes esenciales, y convierte la diferencia del m&eacute;todo de concentraci&oacute;n de microalgas en un hecho muy relevante.</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Adem&aacute;s, las pastas obtenidas por centrifugaci&oacute;n mostraron una mayor estabilidad bioqu&iacute;mica que las obtenidas por floculaci&oacute;n, tal como se evidencia en sus perfiles de &aacute;cidos grasos (<a  href="/img/revistas/rbt/v59n4/a06t1.gif">Cuadro 1</a>) y en su baja relaci&oacute;n feofitina <i>a</i>/clorofila <i>a </i>(<a  href="/img/revistas/rbt/v59n4/a06i2.jpg">Fig. 2</a>). Este comportamiento se deber&iacute;a a que las c&eacute;lulas sufren menor da&ntilde;o f&iacute;sico al ser centrifugadas, resultado que se respalda en las investigaciones de Beneman <i>et al</i>. (1980), Montaini <i>et al</i>. (1995), Albentosa <i>et al</i>. (1997), D`Souza <i>et al. </i>(2000), Heasman <i>et al</i>. (2000), Molina-Grima <i>et al</i>. (2003) y Nunes <i>et al</i>. (2009), quienes coinciden en las ventajas comparativas de este m&eacute;todo de cosecha.</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Algunos autores han indicado que la estabilidad bioqu&iacute;mica, as&iacute; como la viabilidad celular de las pastas de microalgas puede mejorarse a trav&eacute;s del uso de aditivos, tipo antioxidantes. Heasman <i>et al</i>. (2000) se&ntilde;alaron que las pastas de <i>Skeletonema </i>con adici&oacute;n de vitamina C como antioxidante, mantienen una calidad nutricional superior a aquellas que carecen de este aditivo; sin embargo, en nuestro estudio las pastas que conten&iacute;an vitamina C no mostraron diferencias significativas, en cuanto a su composici&oacute;n bioqu&iacute;mica, con respecto a las que no conten&iacute;an este aditivo. Resultados similares fueron obtenidos por Robert <i>et al</i>. (2001), quienes encontraron que las pastas de <i>Tetraselmis suecica</i>, obtenidas por centrifugaci&oacute;n y almacenadas sin vitamina C, a 4&deg;C, durante cinco semanas, mantuvieron estable su perfil de &aacute;cidos grasos y su contenido de l&iacute;pidos y prote&iacute;nas. De igual forma, Ponis <i>et al</i>. (2003b) demostraron que pastas de <i>Pavlova lutheri </i>preservadas a 1 y 4&deg;C, sin vitamina C, mantienen inalterable su valor nutricional durante 27 d&iacute;as. Esta concordancia de resultados permite concluir que la baja temperatura ser&iacute;a suficiente para mantener la calidad nutricional de los concentrados de microalgas, no siendo necesaria la adici&oacute;n de preservantes en muchos casos.</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2">A pesar de las ventajas de la centrifugaci&oacute;n para generar concentrados de microalgas, &eacute;sta presenta el inconveniente de ser costosa y poco pr&aacute;ctica cuando se trabaja con grandes vol&uacute;menes de cultivo (Knuckey <i>et al</i>. 2006). Lo anterior ha motivado el uso de floculantes como un m&eacute;todo de cosecha m&aacute;s econ&oacute;mico y adecuado para tratar grandes vol&uacute;menes de cultivo; sin embargo, se ha planteado que las pastas floculadas suelen sufrir mayor deterioro que las centrifugadas debido, principalmente, a que los cambios en el pH y el desequilibrio del potencial i&oacute;nico, producido durante el proceso de floculaci&oacute;n, pueden inducir estr&eacute;s qu&iacute;mico en las c&eacute;lulas de microalgas; lo cual, sin embargo, depender&aacute; de la naturaleza de la pared celular de la especie floculada (Brown &amp; Robert 2002).</font> </div>     ]]></body>
<body><![CDATA[<p style="text-align: justify;"><font face="Verdana" size="2">En el presente trabajo se observ&oacute; que tanto las pastas floculadas con quitosano como las centrifugadas mantuvieron estable su contenido de prote&iacute;nas y l&iacute;pidos, durante el periodo de almacenamiento; no obstante, en las pastas floculadas, el contenido de clorofila <i>a </i>se vio negativamente afectado, con un concomitante incremento en su producto de degradaci&oacute;n: feofitina <i>a</i>. Ponis <i>et al</i>. (2003a) obtuvieron resultados similares con las biomasas floculadas de <i>Chaetoceros calcitrans </i>y <i>Pavlova lutheri</i>, las cuales mantuvieron estable su contenido proteico y lip&iacute;dico, durante tres semanas de almacenamiento a 1&deg;C, a pesar de haber experimentado un incremento de la relaci&oacute;n feofitina <i>a</i>/clorofila <i>a</i>.</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">La estabilidad del perfil de &aacute;cidos grasos obtenida en esta investigaci&oacute;n en las pastas de nutrientes en la alimentaci&oacute;n de especies centrifugadas de <i>Rhodomonas salina</i>, luego del proceso de almacenamiento, ha sido previamente observada en otras especies de microalgas como <i>Tetraselmis suecica </i>e <i>Isochrysis galbana</i>, cuyas pastas han mantenido estable su perfil de &aacute;cidos grasos cuando se preservan a bajas temperaturas (Molina-Grima <i>et al</i>. 1994, Montaini <i>et al</i>. 1995).</font></p>     <div style="text-align: justify;"><font face="Verdana" size="2">Los resultados de esta investigaci&oacute;n indican que la biomasa centrifugada y congelada de <i>R. salina </i>puede ser usada como alimento del rot&iacute;fero <i>Brachionus plicatilis. </i>Al comparar la m&aacute;xima densidad de rot&iacute;feros (325.6rot&iacute;feros/ mL) obtenida con las pastas microalgales centrifugadas se observa que &eacute;sta es superior a las reportadas por Hung (1988) y Guevara <i>et al</i>. (1996), y similar a las obtenidas por G&oacute;mez &amp; G&oacute;mez (1997) quienes utilizaron levadura de panificaci&oacute;n como alimento, y obtuvieron densidades de 60, 218 y 336rot&iacute;feros/mL, respectivamente. De igual forma, nuestros resultados superan a los valores obtenidos por Romero &amp; Otero (2004) (214rot&iacute;feros/ml) y Romero <i>et al</i>. (2006) (250rot&iacute;feros/mL), cuando alimentaron a <i>B</i>. <i>plicatilis </i>con pastas de <i>Chlorella </i>centrifugada y mantenida a 4&ordm;C. Los sistemas de cultivos m&aacute;s tecnificados, que incluyen alimentaci&oacute;n continua con pasta de <i>Nannochloropsis </i>sp., han permitido obtener mayores densidades de rot&iacute;feros (500-1 500Rot&iacute;feros/L) (Pfeiffer &amp; Ludwig 2002). La m&aacute;xima productividad de rot&iacute;feros obtenida en este trabajo (45.15x103rot&iacute;feros/L/d&iacute;a) con las pastas centrifugadas es similar a la lograda por G&oacute;mez &amp; G&oacute;mez (1997) cuando alimentaron a <i>B. plicatilis </i>con levadura de panificaci&oacute;n y superior a las obtenidas por Navarro &amp; Y&uacute;fera (1998) y Romero <i>et al</i>. (2006) cuando usaron como alimento pasta de <i>Chlorella </i>y polvo liofilizado de <i>Nannochloropsis oculata</i>, respectivamente.    <br>     <br> </font></div>     <div style="text-align: justify;"><font face="Verdana" size="2">Otro criterio de mucha importancia en la evaluaci&oacute;n de los cultivos de rot&iacute;feros es la fecundidad, estimada a partir de la relaci&oacute;n huevos/hembra, ya que permite visualizar el estado fisiol&oacute;gico de la poblaci&oacute;n en un momento dado. En esta investigaci&oacute;n, la m&aacute;xima fecundidad se obtuvo con las pastas microalgales centrifugadas (1.5huevos/hembra). Esta fecundidad es superior a las obtenidas por </font><font face="Verdana" size="2">Rueda (1996) (0.6-1.05huevos/hembra) con las microalgas <i>Nannochloris </i>sp., <i>Nannochloropsis </i>sp., <i>Chlorella </i>sp. y polvo de <i>Spirulina </i>sp.; y superan tambi&eacute;n los valores reportados por Romero <i>et al</i>. (2006), cuando alimentaron a <i>B</i>. <i>plicatilis </i>con pasta de <i>Chlorella </i>centrifugada, obteniendo 1 a 1.2huevos/hembra.</font></div>     <p style="text-align: justify;"><font face="Verdana" size="2">A pesar de que en esta investigaci&oacute;n no se analiz&oacute; la composici&oacute;n bioqu&iacute;mica del rot&iacute;fero <i>B. plicatilis</i>, se puede inferir que &eacute;stos debieran presentar una composici&oacute;n bioqu&iacute;mica adecuada, dado que muchos estudios han demostrado que la calidad nutricional de este organismo depende de la composici&oacute;n bioqu&iacute;mica de la microalga utilizada para su alimentaci&oacute;n (Lubzens <i>et al</i>. 1995, Dhert <i>et al</i>. 2001). Recientemente, Seychelles <i>et al</i>. (2009) evidenciaron que el perfil de los &aacute;cidos grasos de los rot&iacute;feros fue similar al de las microalgas usadas para su alimentaci&oacute;n (microalgas frescas o en forma de pasta).</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Las pastas centrifugadas de <i>R. salina </i>caracterizadas en este estudio, tambi&eacute;n podr&iacute;an utilizarse, directamente, como alimento de larvas y juveniles de moluscos bivalvos, debido a su composici&oacute;n bioqu&iacute;mica, espec&iacute;ficamente su perfil de &aacute;cidos grasos. Numerosos estudios han demostrado que las microalgas con altos contenidos de EPA y DHA favorecen el crecimiento de juveniles de <i>Ostrea edulis </i>(Enright <i>et al</i>. 1986) y larvas de <i>Patinopecten yessoensis </i>(Whyte <i>et al</i>. 1989). De igual forma, Nell &amp; O&#8217;Connor (1991) encontraron que las pastas de <i>Pavlova lutheri </i>y <i>Chaetoceros calcitrans </i>refrigeradas a 4&ordm;C por una o dos semanas produjeron mayor crecimiento larvario de la ostra <i>Saccostrea commercialis </i>que el obtenido con las microalgas frescas. McCausland <i>et al</i>. (1999) lograron incrementar hasta en un 87% el crecimiento de juveniles de <i>Crassostrea gigas </i>al alimentarlas con pasta de <i>Skeletonema costatum</i>, cosechada mediante centrifugaci&oacute;n y almacenada a 4&ordm;C. Cabe destacar que el DHA es, en general, un &aacute;cido graso escaso en las microalgas, por lo que su contenido relativamente alto en <i>R. salina </i>(<a href="/img/revistas/rbt/v59n4/a06t1.gif">Cuadro 1</a>) la destaca como una especie de especial valor nutricional para la acuicultura.</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Adem&aacute;s de las ventajas ya mencionadas de utilizar pastas de microalgas como alimento en acuicultura, se ha planteado que su uso podr&iacute;a ser incluso m&aacute;s beneficioso para la salud de los animales que el uso de caldos de microalgas, ya que el medio de cultivo de las microalgas puede contener toxinas y abundantes bacterias, las que pueden inhibir el crecimiento de diferentes organismos animales en cultivo (DeMott <i>et al</i>. 1991, Kiviranta <i>et al</i>. 1991, O&acute;Connor <i>et al</i>. 1992, Lee &amp; Shen 2004, Sun <i>et al</i>. 2008).</font></p>     <p style="text-align: justify;"><font face="Verdana" size="2">Finalmente, se concluye que la centrifugaci&oacute;n, como m&eacute;todo de cosecha, y la congelaci&oacute;n a -20&ordm;C, durante cuatro semanas, sin adici&oacute;n de vitamina C, permiten mantener la calidad nutricional de la pasta de <i>R. salina </i>similar a la del alga fresca y puede ser utilizada como alimento para <i>Brachionus plicatilis</i></font></p> <b><font face="Verdana" size="3">     ]]></body>
<body><![CDATA[<p align="justify">Agradecimientos</p> </font></b><font size="2"> </font><font face="Verdana" size="2">     <p align="justify">Este trabajo fue financiado por la Universidad de Concepci&oacute;n, Chile a trav&eacute;s del proyecto DIUC N&ordm; 208.111.050-1.0 y por el Consejo de Investigaci&oacute;n de la Universidad de Oriente, Venezuela (proyecto CI.-2-030603-1282/06). Se agradece el apoyo brindado para los an&aacute;lisis de los &aacute;cidos grasos a los profesionales: Elena Palacios, Olivia Arjona y Laura Corre&oacute;n del CIBNOR, M&eacute;xico.</p>     <p align="justify"> </p> </font> <hr style="width: 100%; height: 2px;"><font face="Verdana" size="3"><b>     <p align="justify">Referencias</p> </b></font><font size="2"> </font>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Albentosa, M., A. P&eacute;rez-Camacho, U. Labarta &amp; M.J. Fern&aacute;ndez-Reiriz. 1997. Evaluation of freeze-dried microalgal diets for the seed culture of <i>Ruditapes decussatus </i>using physiological and biochemical parameters. Aquaculture 154: 305-321.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745568&pid=S0034-7744201100040000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Alvarez, Z. &amp; J. Ewald. 1990. Efectos de la salinidad y la dieta sobre el desarrollo larvario de <i>Sesarma ricordi </i>(Milne Edwards, 1853) (Decapoda, Grapside). Scient. Mar. 54: 55-60.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745570&pid=S0034-7744201100040000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Beneman, J., B. Koopman, D. Eisenberg &amp; R. Goebel. 1980. Development of micro-algae harvesting and high rate pond technologies in California, p. 457- 495. <i>In </i>G. Shelef &amp; C. Soeder (eds.). Algae biomass. Elsevier/North Holland Biomedical, Amsterdam, Holanda.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745572&pid=S0034-7744201100040000600003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p align="justify"><font face="Verdana" size="2">Seychelles, L., C. Audet, R. Tremblay, R. Fournier &amp; F. Pernet. 2009. Essential fatty acid enrichment of cultured rotifers (<i>Brachionus plicatilis</i>, M&uuml;ller) using frozen-concentrated microalgae. Aquacult. Nutr<i>. </i>15: 431-439.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745684&pid=S0034-7744201100040000600059&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Sun, Y., C. Wang &amp; J. Chen. 2008. Growth inhibition of the eight species of microalgae by growth inhibitor from the culture of <i>Isochrysis galbana </i>and its isolation and identification. J. Appl. Phycol. 20: 315-321.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745686&pid=S0034-7744201100040000600060&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Theilacker, G. &amp; M. McMaster. 1971. Mass culture of the rotifer <i>Brachionus plicatilis </i>and its evaluation as food larval anchovies. Mar. Biol. 10: 183-188.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745688&pid=S0034-7744201100040000600061&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Tremblay, R., S. Cartier, P. Miner, F. Pernet, C. Quere, J. Moal, M. Muzellec, M. Mazuret &amp; J. Samain. 2007. Effect of <i>Rhodomonas salina </i>addition to standard hatchery diet during the early ontogeny of the scallop <i>Pecten maximus</i>. Aquaculture 262: 410-418.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745690&pid=S0034-7744201100040000600062&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Tzovenis, I., G. Triantaphyllidis, X. Naihong, E. Chatzinikolaou, K. Papadopoulou, G. Xouri &amp; T. Tafas. 2004. Cryopreservation of marine microalgae and potencial toxicity of cryoprotectants to the primary steps of the aquacultural food chain. Aquaculture 230: 457-473.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745692&pid=S0034-7744201100040000600063&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="Verdana" size="2">Whyte, J., N. Boume &amp; C. Hodgson. 1989. Influence of algal diets on biochemical composition and energy reserves in <i>Patinopecten yessoensis </i>(Jay) larvae. Aquaculture 78: 333-347.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745694&pid=S0034-7744201100040000600064&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Y&uacute;fera, M. &amp; N. Navarro. 1995. Population growth dynamics of the rotifer <i>Brachionus plicatilis </i>cultured in non-limiting food condition. Hydrobiologia 313/314: 399-405.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745696&pid=S0034-7744201100040000600065&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Zar, J. 1984. Biostatistical analysis. Prentice Hall, Englewoods Cliff, Nueva Jersey, EEUU.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745698&pid=S0034-7744201100040000600066&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">Zhukova, N. &amp; N. Aizdaicher. 1995. Fatty acid composition of 15 species of marine microalgae. Phytochemistry 39: 351-356.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1745700&pid=S0034-7744201100040000600067&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><br> </font></p>     <p align="justify"><font face="Verdana" size="2">    <br> </font></p> <a name="Correspondencia"></a><font face="Verdana" size="2">Correspondencia a: Miguel Guevara. </font><font face="Verdana" size="2">Departamento de Bot&aacute;nica, Facultad de Ciencias Naturales y Oceanogr&aacute;ficas, Centro de Biotecnolog&iacute;a, Universidad de Concepci&oacute;n, Casilla 160-C, Concepci&oacute;n, Chile; <a href="mailto:miguevara2003@yahoo.es">miguevara2003@yahoo.es</a> / </font><font face="Verdana" size="2">Instituto Oceanogr&aacute;fico de Venezuela, Universidad de Oriente, Apartado 6101, Cuman&aacute;, Venezuela</font>     ]]></body>
<body><![CDATA[<br> <font face="Verdana" size="2">Leandro Bastardo. </font><font  face="Verdana" size="2">Instituto Oceanogr&aacute;fico de Venezuela, Universidad de Oriente, Apartado 6101, Cuman&aacute;, Venezuela; <a href="mailto:l.bastardo@hotmail.com">l.bastardo@hotmail.com</a></font>    <br> <font face="Verdana" size="2">Roraysi Cortez. </font><font  face="Verdana" size="2">Instituto Oceanogr&aacute;fico de Venezuela, Universidad de Oriente, Apartado 6101, Cuman&aacute;, Venezuela; <a href="mailto:roraysi@yahoo.com">roraysi@yahoo.com</a></font>    <br> <font face="Verdana" size="2">Bertha Arredondo-Vega. </font><font  face="Verdana" size="2">Centro de Investigaciones Biol&oacute;gicas del Noroeste, S. C. (CIBNOR), Baja California, M&eacute;xico; </font><a  href="mailto:kitty04@cibnor.mx"><font face="Verdana" size="2">kitty04@cibnor.mx</font></a><font  face="Verdana" size="2"> </font>    <br> <font face="Verdana" size="2">Lolymar Romero. </font><font  face="Verdana" size="2"> Instituto Universitario de Tecnolog&iacute;a, Apartado 6101, Cuman&aacute;, Venezuela; </font><a  href="mailto:lolyrome@yahoo.com"><font face="Verdana" size="2">lolyrome@yahoo.com</font></a>    <br> <font face="Verdana" size="2">Patricia G&oacute;mez. </font><font  face="Verdana" size="2">Departamento de Bot&aacute;nica, Facultad de Ciencias Naturales y Oceanogr&aacute;ficas, Centro de Biotecnolog&iacute;a, Universidad de Concepci&oacute;n, Casilla 160-C, Concepci&oacute;n, Chile; <a href="mailto:pgomez@udec.cl">pgomez@udec.cl</a></font> <hr style="width: 100%; height: 2px;"><font face="Verdana" size="2">     <p align="center">Recibido 14-XII-2010. Corregido 02-III-2011. Aceptado 05-IV-2011.</p> </font><font size="2"> </font>      ]]></body><back>
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