Distributional and reproductive aspects of the bigeye thresher shark (Alopias superciliosus) in the Atlantic ocean
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AuthorsFernandez-Carvalho, J. (Joana); Coelho, R. (Rui); Cortés, E. (Enric); Mejuto-García, J. (Jaime); Domingo, A. (Andrés); Yokawa, K. (Kotaro); García-Cortés, B. (Blanca); Forselledo, R. (Rodrigo); Ohshimo, S. (Seiji); Ramos-Cartelle, A. (Ana); Santos, M.N. (Miguel Neves)
The bigeye thresher shark, Alopias supercilious is sometimes caught as bycatch in pelagic longline fisheries targeting tunas and swordfish in the Atlantic Ocean. As part of an ongoing cooperative program for fisheries and biological data collection, fishery observer data from various fishing nations and projects were compiled and analyzed. Those data sets include information on geographic location of the observations, as well as size, sex and in some cases maturity stage. A total of 4371 bigeye threshers were recorded throughout the Atlantic Ocean between 1992 and 2013, with the sizes ranging from 70 to 305 cm FL (fork length). Considerable variability was observed in the catchat- size, with particular emphasis on the tropical region where the mean sizes tended to be smaller than in the other regions. The expected distribution of juvenile and adult specimens also showed considerable variability, and the sex-ratios varied between regions and size classes. Maturity ogives were ...
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