C. sapidus fisheries has a significant influence on the economy of some countries in North America and has a relative extensive literature in these regions. However, only few papers discuss the ecology of C. sapidus in the South Atlantic, despite its economic importance in that region. We studied the fecundity, reproductive seasonality and maturation size of C. sapidus females captured in the Southeast coast of Brazil from January to December 2002. Females were separated, weighted (Wt), and cephalothorax width (CW) was measured. Furthermore, the eggs-masses were classified according to embryonic development, separated, weighted (We) and fixed. Eggs were also separated and counted, resulting in the average number of eggs per individual (Ne). A total sample of 307 females was collected: 78 young, 130 adults and 99 ovigerous. Ovigerous females showed CW between 7.49 and 15.89cm with average of 12.21cm and were distributed throughout the sample period, with highest incidence between December and March. The onset of morphological maturity (L50) occurred at CW=10.33cm, and the size in which all were mature (L100) was CW=11.20cm. Individual fecundity ranged from 689 356 to 3 438 122 with an average of 2 006 974. The CW showed a positive growth trend with Ne and We. We concluded that in order to ensure the resource sustainability, it is necessary to prohibit captures of C. sapidus in these regions, especially during summer. Additionally, our studies suggest that the minimum capture size should be 11cm of carapace width.
Key words: blue crab, reproductive biology, fisheries resource, estuarine.
Resumen
Hay pocos estudios sobre la ecología de C. sapidus en el Atlántico Sur, a pesar de su importancia económica en la región. El presente estudio tiene como objetivo conocer la fecundidad, periodo reproductivo y talla de primera madurez morfológica de las hembras de C. sapidus, con el fin de contribuir a una mejor comprensión de la especie en el Atlántico occidental, así como ayudar en la toma de medidas de gestión en la región. Las muestras fueron recolectadas mensualmente de enero a diciembre 2002 en sudeste del Brazil. Se recogieron 307 hembras: 78 jóvenes, 130 adultos y 99 ovígeras. Las hembras ovígeras mostró su intervalo de talla de 7.49-15.89cm ancho del carapazón (AC) y se distribuyeron en todo el período de la muestra, con mayor incidencia entre diciembre y marzo. El inicio de la madurez morfológica (L50) fue con la AC=10.33cm y el tamaño que tenían todos los maduros (L100) con AC de 11.20cm. Fecundidad individual osciló entre 689 356 a 3 438 122, con una media 2 006 974. El AC mostró una tendencia positiva en el crecimiento con número de huevos y el peso del huevos. El conocimiento de los aspectos reproductivos de la población es importante en la definición de medidas de gestión para el uso sostenible con el fin de renovar y continuar con la misma.
Among the species of the genus Callinectes, the blue crab (
Callinectes sapidus Rathbun 1986) is the most economically important in the Western Atlantic, especially in North America, with a rich literature available for the United States of America and Mexico (Millikin & Williams 1984, Prager et al. 1990). Despite this extensive knowledge on the topic, one cannot generalize the data collected as rules to be applied to other geographic regions (Mantelatto & Fransozo 1999, Ortiz-Leon et al. 2007). In South America for example, the literature on C. sapidus is scarce and ]]>
C. sapidus is ]]>
The life of C. sapidus occurs in a ]]>
During the ]]>
The knowledge of reproductive aspects of the C. sapidus is of great importance in the management aiming at conservation, since variations in the reproductive stock directly influence their population renewal (Knuckey 1996). Fecundity, reproductive seasonality, and size at sexual maturity are important aspects of reproductive biology of the crab (Rasheed ]]>
In Brazil, fishing of C. sapidus has economic and social importance mainly in the State of São Paulo. Two areas of higher focus are the estuaries of Santos-São Vicente and the Lagoon-Estuarine Complex of Iguape and Cananeia. In the latter, fishing activity is intense and its productivity is ]]>
Despite the economic importance of the species in the region of the Lagoon-Estuarine Complex of Iguape and Cananéia, there is no research on the reproductive aspects of
C. sapidus. The present work aims to provide an evaluation of the fecundity, reproductive seasonality, and maturation size of C. sapidus females, after their migration to more saline waters. It also aims to provide a contribution to the knowledge of the species behavior in the South of the Western Atlantic. Finally, it intends to offer a way to contribute to the definition of management strategies for the species survival in the region.
Materials and methods
Study area: The study site is located in the estuary exit of the Lagoon-Estuarine Complex of Iguape and Cananéia-SP (25°03’2’’ S - 47°54’44’’ W) in ]]>
2 drainage area (Fig. 1). The salinity and water temperature in the study area, range from 28 to 35 with an average of 31, and 19 to 23.2 with an average of 20.5°C, respectively, and are influenced by the tide changes and rainfall regimes (Bernades & Miranda 2001, Severino- Rodrigues et ]]>
This region has preserved its natural features and is being recognized by the UNESCO (2005) as the third most productive ecosystem in the South Atlantic. Based on patterns of sustainable development, the region was nominated as a World Natural Heritage Site for its importance to research and knowledge.
The specimens were collected with 12 traps, baited with fish scraps, measuring 60x45x25cm (mouths of 12x7cm), with apertures of 2cm between nodes. Traps were connected to a cable in the form of a long-line and released in the same region with the aid of a boat. Traps remained immersed for two hours during the low tide of the full moon in a day of each month (January to December, 2002).
Material analysis: Specimens captured were identified to the species level (Williams 1974) and their sex was identified (Taissoun 1973). Females of C. sapidus were kept on ice until manipulation.
In the laboratory, each fresh animal without egg masses was measured for carapace width (CW), which is the distance between the lateral spines tips (caliper accuracy of 0.05mm) and weighted (Wt). The maturity stages of juveniles and adults (+ovigerous), were defined macroscopically by the form of the abdomen and the presence of egg masses (Taissoun 1973, Williams 1974). We separated the ovigerous females for fecundity analysis. The Chi-square (χ2) test was used to evaluate if the male to female ratio of the population was 1:1 at a confidence level of 95%. The Komolgorov- Smirnov (K-S) test was used to verify the normality of the size- frequency distribution to ovigerous females.
Fecundity: The egg masses were classified according to the embryonic development into: I-initial (yellow), II-intermediate (orange), and III-pre-hatching (dark brown) (Ramach et al. 2009), with the fecundity analyses (egg counting) included only in stages I and II. Stage III was not included given that eggs in advanced development stage (III) are more susceptible to accidental release, which may lead to fecundity underestimation (Costa & Negreiros- Fransozo 1996). The egg masses were removed and weighed. We discounted the weight of pleopods (We) and fixed the material in 70% alcohol solution. Eggs were separated in a 5% sodium hypochlorite solution subsampled by the Motoda (1959) separator, and counted. This result was the average number of individual eggs (No).
Reproductive seasonality: The sampling was conducted between January and December (2002), with the idea of establishing the spawning period based on the months of highest concentration and abundance of ovigerous females.
Morphology maturation size: In order to estimate the size at which 50% of the female population reaches first sexual maturity (L50), a software was used resulting into a “R” of 2.13 (Ihaka & Gentleman 1996). This software followed a sigmoid model (y=1/1+exp(LC-LC50)), and it considered juveniles and adults (+ ovigerous).
Results
A total of 452 C. sapidus were caught, being 307 females (229 adults and 78 juveniles), corresponding to 67.9% of the total, and 145 males (114 adults and 31 juveniles), corresponding to 32.1% of the total, with a sex ratio (M:F) of 1:2.1 significantly different from the expected 1:1 (χ2=58.06, p<0.0001). Adult specimens corresponded to 79.9% of the sampled population.
The study included only females with 78 juveniles (25%), 130 adults (43%) and 99 ovigerous females (32%). The smallest female collected had CW=4.30 and the largest 15.89cm. The mature ones had a CW slightly above 6.95cm and the ovigerous females showed amplitude between 7.49cm and 15.89, with an average of 12.21cm (±1.57). Ovigerous females occurred throughout the annual cycle with greater participation in December (n=11), January (n=10), February (n=11) and March (n=12) (Fig. 2).
The onset of morphological maturity (L50) occurred in females with CW=10.33cm (Fig. 3) and total maturity (L100) of 11.25cm. There was predominance of females with eggs in stage II (57%), followed by stages I (30%) and III (13%). Individual fecundity ranged from 689 356 to 3 438 122 with average of 2 006 974 (±991 071). The overall size–frequency distribution of the ovigerous females showed a normal distribution (K-S test, p=0.43), with predominance in classes 11 to 14cm. The CW showed a positive growth trend with the number (Ne) and weight (Wt) of the eggs (Table 1).
Discussion
]]>
The predominance of adult specimens and ovigerous females of C. sapidus in the exit of Lagoon-Estuarine Complex of Iguape and Cananéia (SP) characterizes the sampling site as a spawning area. This area is very important in the life cycle of the species, in which mature and ovigerous females move to higher salinity waters for gonads maturation. Salty water ensures lower larval mortality as compared to waters with salinity variations; further, the benefits ]]>
]]>
C. sapidus ovigerous females breed throughout the year, predominating in warm months. Such a trend has been observed in most tropical brachyuran (Rasheed & Mustaquim 2010, Severino-Rodrigues et al. 2012). This reproductive pattern of C. sapidus can be classified as “seasonal-continuous” in Brazil, which means higher incidence in certain seasons of ]]>
The size of the C. ]]>
at first maturity obtained in this study was smaller than those cited in the literature for species in Brazil by Pereira et al. (2009) in the Baia de Babitonga (L50=12.0cm). Also bigger sizes were found in the United States by Van-Engel (1958) in Chesapeake Bay (L50=11.2cm); Fisher (1999) in Texas (L50=12.0cm), Guillory & Hein (1997) in Louisiana (L50=12.5cm). ]]>
Factors that influence variation in size of maturity in C. sapidus can be: environmental (temperature and salinity), geographic and over-fishing, with morphological changes associated with the maturation of males and females. Lipcius & Stockhausen (2002) found that in Chesapeake Bay (USA) the average size at maturity decreased by ]]>
Individual fecundity obtained in this study was performed without the distinction of spawning related to the multiple clutches. Even so, the results showed higher spawning than observed by Van-Engel (1958) (from 1 750 000 to 2 000 000), ]]>
]]>
Selectivity and exploitation may influence the hereditary characteristics of the population. Some possible scenarios should be evaluated whenever possible. They include: the average size of individuals, morphological maturity and fecundity. In the study area, the capture of C. sapidus is intense and selectively is targeted to adult males. Mendonça et al. (2010) noted that the captures have shown periods of significant fluctuations in the index of abundance in recent years, requiring ]]>
Management of commercial crab fishery in other maritime countries using the basic “3-S” restrictions (sex, size, and season) have kept crabs stocks sustainable over the past several years (Helliwel 2009). In sum, our study concludes that in order to ensure resource ]]>
C. sapidus captures in the exit of the estuary, especially during summer and to limit the minimum capture size at 11cm of carapace width. We firmly believe that this 11cm size, if respected by the fishermen, can contribute effectively to sustainable resource exploitation and stock maintenance.
Acknowledgments
The authors would like to thank Jocemar T. Mendonça for support logistic, Felipe Duarte for the suggestions for data processing, Matheus Marcos Rotundo assistance in the preparation of the map, two anonymous reviewers provided comments on this manuscript and CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior) for the Masters grants awarded to Joelson ]]>
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*Correspondencia a:Evandro Severino-Rodrigues: Scientific Researcher, Núcleo de Pesquisa e Desenvolvimento do Centro APTA do Pescado Marinho do Instituto de Pesca. Av. Bartolomeu de Gusmão, 192CEP: 11030-906 Santos- SP, Brazil; evansero@pesca.sp.gov.br Joelson Musiello-Fernandes: Instituto de Pesca-São Paulo, Master Program in Aquaculture and Fisheries in Instituto de Pesca-Brazil; fernandes.joelson@terra.com.br Álvaro A.S. Moura: Instituto de Pesca, Trainee, Centro APTA do Pescado Marinho; gutsmoura@hotmail.com Geisa M.P. Branco: Instituto de Pesca, Trainee, Centro APTA do Pescado Marinho; geisaprincipe@hotmail.com Victor O.C. Canéo: Instituto de Pesca, Trainee, Centro APTA do Pescado Marinho; victorcaneo79@hotmail.com 1. Scientific Researcher, Núcleo de Pesquisa e Desenvolvimento do Centro APTA do Pescado Marinho do Instituto de Pesca. Av. Bartolomeu de Gusmão, 192CEP: 11030-906 Santos- SP, Brazil; evansero@pesca.sp.gov.br 2. Instituto de Pesca-São Paulo, Master Program in Aquaculture and Fisheries in Instituto de Pesca-Brazil; fernandes.joelson@terra.com.br 3. Instituto de Pesca, Trainee, Centro APTA do Pescado Marinho; gutsmoura@hotmail.com, geisaprincipe@hotmail.com, victorcaneo79@hotmail.com ]]>
Received 08-II-2012. Corrected 20-VIII-2012. Accepted 20-IX-2012. ]]>2005319117-128199046145-158200149115-132198811231-239200460567-579195816180-191199639393-400200679273-285199646487-49520089870-771999128499-5061997595-7200937491-500198269309-320199314239-25719965299-3141986671361-1371200222645-6119997263-73199313551-56320107037-451959773-94198413843200696305-313200755235-2452009891341-1351200222416-4281977201-190199046170-179201010356-62200928635-64020093547-6020123831-411998195168-173197377-23.UNESCO20051958206-1200126301-306197472685-79819904683-94