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De Rezende G.A.,Grande Rio University | Neunfeld A.L.,Grande Rio University | Estima S.C.,Nucleo de Educacao e Monitoramento Ambiental NEMA | Dumont L.F.C.,Grande Rio University
Pan-American Journal of Aquatic Sciences | Year: 2015

Artisanal fishermen of pink shrimp (Farfantepenaeus paulensis) from Patos Lagoon estuary have called for changes in the legislation that controls this fishery. They would like the opening of the season to change from a fixed calendar to a floating calendar that is controlled by the time that the shrimp reach the minimum landing size. They asked for the release of the use of otter-trawls nets, arguing that they can capture larger shrimp than with the permitted fishing gear (fyke-nets). We analyzed the size structure of the pink shrimp captured with otter-trawls and focused on the capture proportions of shrimp that are larger and smaller than the capture size defined by the legislation (90 mm total length). The shrimp harvested by trawl were not in accordance with the minimum size required by law. The month, region, and fishing depth exerted influence on the variability of the proportions of shrimp larger and smaller than allowed. Therefore, it is recommended that the current legislation remains in place. However, if there is an approval for this demand, the shrimp measurements to release the season must be conducted in multiple regions of the estuary due to the variability of the shrimp sizes according to the region. Source

Proietti M.C.,Grande Rio University | Reisser J.W.,Grande Rio University | Reisser J.W.,University of Western Australia | Kinas P.G.,Institute Matematica | And 4 more authors.
Marine Ecology Progress Series | Year: 2012

Genetic structure and natal origins of green turtle mixed stocks in southern Brazil were assessed based on analyses of mtDNA control region sequences from the Arvoredo Island (n = 115) and Cassino Beach (n = 101) feeding areas. These were compared to other mixed aggregations to examine structuring, and to Atlantic Ocean nesting colonies to evaluate natal origins through Bayesian mixed stock analysis (MSA). In order to develop novel priors, surface drifter trajectories in the Atlantic were analyzed and combined with rookery data, and we used Kulback-Leibler information measures in order to compare the difference of information among the 4 proposed priors. Each study area presented 12 haplotypes, 10 of which were shared at similar frequencies. Haplotypes CM-A8 and CM-A5 represented ∼60 and 20%, respectively, and remaining haplotypes accounted for <5% of samples. The 2 study areas were genetically similar to all feeding grounds in the western South Atlantic except Almofala, in northeast Brazil, and genetically different from Caribbean and North American mixed stocks. Drifter trajectory analysis revealed that drifters from Ascension and Trindade Islands have a larger chance of reaching Brazil. The priors drifter data and rookery size/drifter data combined contained the most information, but stock estimates were not greatly changed. MSA indicated that Ascension, Aves/Surinam and Trindade were the main stock contributors to the study areas. Since impacts on mixed stocks may affect populations thousands of km away, the results presented here have important implications for the conservation of this endangered species. © 2012 Inter-Research. Source

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