A DISTRIBUIÇÃO ESPACIAL E A COMPOSIÇÃO DAS CAPTURAS DE ELASMOBRÂNQUIOS PELA FROTA DE EMALHE DE PASSO DE TORRES - SC, NA COSTA SUL DO BRASIL, NO VERÃO DE 2004/2005.
The elasmobranch fishes are exploited by many fisheries gears in Rio Grande do Sul state. The purposes of this study were to describe the inshore fishery of Passo de Torres (SC), south frontier with Rio Grande do Sul state, to assess the elasmobranchs catches and its composition, and to deliniate their spatial distribution in south continental shelf. Thirty-four landings and nine fishing trips as observer in commercial fishing vessel were monitored, between November 2004 and March 2005. The fleet was compounded by 30 fishing vessels, with size between 10-20 m, and utilized surface and bottom gillnets to capture teleosts and elasmobranch fishes. Fifteen shark and 12 ray species were recorded in this study. Sphyrna lewini had the highest landing in total weight, followed by Rhinobatos horkelii. Among teleosts, Micropogonias furnieri had the highest landing in total weight. The bottom gillnets, specially the one directed for M. furnieri, had the highest capture of Carcharhinus sp., which utilize the area as nursery grounds during the summer. Others elasmobranchs were also by-catch from gillnets. In the study area, the main problems to shark conservation are heavy fishing pressure and by-catch, that capture high numbers of newborn. To shark management in south Brazil, we suggest the exclusion of fisheries with directed gears for elasmobranchs, and the creation of fisheries reserves in these critical habitats for newborn, young and adults.
Advisor:Carolus Maria Vooren; Marlise de Azevedo Bemvenuti; Rosângela Paula Teixeira Lessa; Mônica Brick Peres; Jorge Pablo Castello
School:Fundação Universidade Federal do Rio Grande
Source Type:Master's Thesis
Keywords:emalhe elasmobrânquios Carcharhinus sp. Inshore fisheries gillnet elasmobranchs nursery
Date of Publication:05/30/2006