<?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>S0034-77442015000300727</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir]]></article-title>
<article-title xml:lang="es"><![CDATA[Estructura poblacional y período reproductivo de dos especies introducidas de peces en una represa de una región semiárida brasileña]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sousa]]></surname>
<given-names><![CDATA[Marla Melise de Oliveira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopes]]></surname>
<given-names><![CDATA[Suzany Iasnaya Moreira]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[Rodrigo Silva da]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Novaes]]></surname>
<given-names><![CDATA[José Luís Costa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,marla_melise@hotmail.com, suzanymoreira@hotmail.com, rdgcosta@ufersa.edu.br, novaes@ufersa.edu.br  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2015</year>
</pub-date>
<volume>63</volume>
<numero>3</numero>
<fpage>727</fpage>
<lpage>739</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442015000300727&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442015000300727&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442015000300727&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The Amazonian fish species Plagioscion squamosissimus(Sciaenidae) and Cichla monoculus(Cichlidae), have been widely introduced into different reservoirs in Brazil, and have caused many negative impacts on local fish fauna. The aim of this study was to evaluate the population structure (abundance, length structure, length-weight relationship, sex ratio, and length at first maturity) and the reprodutive period of these two species in the Santa Cruz Reservoir (built in 2002), located in the Brazilian semiarid region, for their adequate management and local species conservation policies. Specimens were collected quarterly in eight sites from February 2010 to November 2013 using gillnets (12 to 70 mm mesh between adjacent knots). The specimens captured were counted and the following biometric and biological data were analysed: standard length, total weight, and reproductive data, such as, sex, weight and gonadal maturity stage. The species abundances were estimated by CPUE and expressed as the number of individuals per gill net area x gill net exposition time (m2 x h); length frequency histograms were built with intervals of 5 cm. The length-weight parameters were estimated with a linear regression after a logarithmic transformation of the data. With the reproductive data we estimated sex ratio, reproduction period and length at first maturity (L50). We captured a total of 1 071 specimens of P. squamosissimusand 156 specimens of C. monoculus.Both species showed higher abundances in 2010, 0.004306 m2 x h and 0.00022 m2 x h, respectively, but this parameter decreased from 2010 to 2013. Standard length ranged between 6.4 and 46.2 cm for P. squamosissimus(20.025.0 cm was the most frequent class), and 7.0 and 38.7 cm for C. monoculus(10.0-15.0 cm was the most frequent class). The length-weight relationships were described by the following equations: log10Wt = -1.8349+3.0899log10Lp and R2 = 0.9795 for P. squamosissimus,and log10Wt = -1.7944+3.0885log10Lp and Wt = 0.0160 and R2 = 0.9929 for C. monoculus;both species exhibited positive allometric growth. The sex ratio for both species differed from 1:1, with a predominance of females for P. squamosissimusand males for C. monoculus.The Lp50 was estimated to be 15.90 cm for P. squa-mosissimusand 15.65 cm for C. monoculus,and the reproductive data indicated that both species reproduced throughout the year. We concluded that although the population of both species reduced their abundance over the study period, P. squamosissimusand C. monoculusare established and structured populations in the Santa Cruz Reservoir with individuals growing satisfactorily and reproducing in all seasons, without a well-defined reproductive peak. We suggest that the managers may allow the artisanal and/or sport fisheries of these species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las especies de peces amazónicos Plagioscion squamosissimus(Sciaenidae) y Cichla monoculus(Cichlidae), se han introducido ampliamente en diferentes embalses en Brasil, y han causado muchos impactos negativos sobre la fauna de peces locales. El objetivo de este estudio fue evaluar la estructura poblacio-nal (abundancia, estructura de tallas, relación talla-peso, proporción de sexos, y talla de primera madurez) y el período reproductivo de estas dos especies en la represa Santa Cruz, (construida en el 2002), situada en la región semiárida de Brasil. Las muestras se recogieron trimestralmente en ocho sitios de febrero 2010 a noviembre 2013 mediante redes de pesca (12 a 70 mm). Los ejemplares capturados se contaron y se analizaron los siguientes datos bio-métricos y biológicos: longitud estándar, peso total, y datos reproductivos, tales como: sexo, peso y estado de madurez gonadal. Capturamos un total de 1 071 ejemplares de P. squamosis-simusy 156 de C. monoculus.Ambas especies mostraron mayor abundancia en el 2010, 0.004306 m2 x h y 0.00022 m2 x h, respectivamente, pero este parámetro disminuyó de 2010 a 2013. La longitud estándar osciló entre 6.4 y 46.2 cm para P squamosissimusy 7.0 y 38.7 cm para C. monoculus.Las relaciones talla-peso fueron descritas por las siguientes ecuaciones: log10Wt = -1.8349 + 3.0899log10Lp y R2 = 0.9795 para P squamosissimusy log10Wt = -1.7944 + 3.0885log10Lp y Wt = 0.0160 yR2 = 0.9929 para C. monoculus;ambas especies mostraron un crecimiento alométrico positivo. La proporción de sexos para ambas especies difirió de 1:1, con un predominio de hembras en P. squamosissimusy machos en C. monoculus.El LP50 se estimó en 15.90 cm para P. squamosissimusy 15.65 cm para C. monoculus,los datos de reproducción indicaron que ambas especies se reproducen durante todo el año. Llegamos a la conclusión de que aunque la población de ambas especies redujo su abundancia durante el período de estudio, P. squamosissimusy C. monoculusestán establecidas y estructuradas en la represa Santa Cruz con individuos creciendo satisfactoriamente y reproduciéndose en todas las estaciones, sin un pico reproductivo bien definido. Sugerimos que los administradores permitan que la pesca artesanal y / o deportivas de estas especies]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cichla monoculus]]></kwd>
<kwd lng="en"><![CDATA[Plagioscion squamosissimus]]></kwd>
<kwd lng="en"><![CDATA[dam]]></kwd>
<kwd lng="en"><![CDATA[population structure]]></kwd>
<kwd lng="en"><![CDATA[reproductive period]]></kwd>
</kwd-group>
</article-meta>
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