-This study was conducted in two estuarine inlets (Saco da Mangueira and Saco do Arraial) at the Patos Lagoon estuary, southern Brazil. The changes in relative abundance and size of post-larvae and juvenile shrimp Farfantepenaeus paulensis and juvenile blue crab Callinectes sapidus were compared, considering the influence of salinity and the presence of submerged seagrass meadows. The analyses were performed using generalized linear models (GLM) for abundance variations and ANOVA for variations on the size of individuals. The pink shrimp was more abundant at Saco da Mangueira, in seagrass meadows and areas of higher salinity. The blue crab was more abundant at Saco do Arraial and in lower levels of salinity. The importance of submerged vegetation for the blue crab lies in a preference of smaller crabs of the species for the seagrass meadows. It has been shown that these species choose different habitats in the estuary, and both the salinity and the presence of submerged seagrass meadows influence the selection of habitat.
CEP: 96201-900-Caixa postal: 474. RESUMO O camarão-rosa Farfantepenaeus paulensis utiliza o estuário da Lagoa dos Patos durante o seu desenvolvimento juvenil, e neste ambiente torna-se um importante recurso para a pesca artesanal. Neste trabalho foram analisados os tamanhos dos camarões capturados pelas redes de "saquinho"; e a abundância relativa (CPUE) dos juvenis e pré-adultos em três áreas distintas, no entorno da Ilha dos Marinheiros, durante a safra pesqueira de 2009 (fevereiro a maio). Foram tomadas as medidas do comprimento da carapaça, através das quais se estimou o percentual de camarões com tamanho inferior ao permitido por lei. A CPUE foi estimada em três áreas adjacentes através das informações de desembarque da pesca artesanal. As variações diárias da salinidade foram acompanhadas durante o período de pesca através de coleta manual de água. Em todas as áreas, durante toda a safra, as capturas de camarões com tamanho inferior ao permitido por lei foram superiores ao percentual permitido. A CPUE mostrou-se significativamente diferente entre as áreas. As maiores abundâncias ocorreram nos dois primeiros meses de safra.
We evaluated the incidental catch of the blue crab in artisanal fisheries through the analysis of sex ratio, catch per unit effort, net positioning, and size in which the capture probability was 50% (P 50). The specimens were collected from 2011 to 2013 in the estuary of Patos Lagoon, southern Brazil. The analysis showed a higher occurrence of males. Variations in the catch per unit effort showed greatest abundance values close to the mouth of the estuary. Catch per unit effort was similar when comparing fishing seasons and net positions. P 50 indicated a low selectivity of the nets since it varied between studied areas but stayed below the size at first maturity. Catches indicated a greater effort on males, since females migrated to spawn in the ocean area adjacent to the estuary during the fishing period studied. The spatial variation of the catch per unit effort showed heterogeneity in fishing catches. Thus, optimal management of the resource should consider the particularities of each area.
The spatial and temporal variability in the relative abundance of the post-larvae (PL) and juvenile (JU) stages of the pink shrimp Farfantepenaeus paulensis was investigated in the estuary of Lagoa dos Patos, southern Brazil. This analysis enabled the identification of differential distribution patterns. Pink shrimp abundance was studied to understand what factors influence the occupation of the estuary. Monthly samples were taken with a trawl net at 12 sites in the estuary from September 2010 to January 2013. Comparisons were made between protected and unprotected sites. Both PL and JU had a wide distribution in the estuary. The temperature was not a significant variable for explaining abundance variability. The abundance of PL increased with salinity and influenced PL entry to the estuary. The highest abundances of PL were found in unprotected areas and protected sites at the mouth of the estuary, while juveniles were unevenly distributed with higher abundance in protected areas. Recruitment period of PL in the estuary was October to March, and of juveniles was November to February. We suggest that the preservation of unprotected shallow waters and protected areas at the mouth of the estuary are key to further recruitment of the species in the estuary.
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