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Article << Previous     |     Next >>   Contents Vol 49(7)

Pelagic elasmobranchs caught by longliners off southern Brazil during 1974–97: an overview

A. F. Amorim, C. A. Arfelli and L. Fagundes

Marine and Freshwater Research 49(7) 621 - 632

Abstract

From 1974 to 1997 elasmobranchs caught by longliners based in Santos City, São Paulo State, Brazil, have been identified and the biology of some of the species has been studied. The fleet has fished since 1968, and in 1996 comprised 16 boats operating in the area 17–35ºS,27–52ºW. Since 1977 yields of sharks have shown an increasing trend, reaching ~60% of the longline total catch in 1993. Blue shark (Prionace glauca) was the main species and responsible for about 30% of the total catch of the Santos longliners. The 33 shark and 2 ray species identified belonged to the following families and genera: Alopiidae (Alopias), Carcharhinidae (Carcharhinus, Galeocerdo, Prionace) Hexanchidae (Heptranchias, Hexanchus), Lamnidae (Isurus, Lamna), Megachasmidae (Megachasma), Odontaspididae (Carcharias, Odontaspis), Pseudocarchariidae (Pseudocarcharias), Rhincodontidae (Rhincodon), Sphyrnidae (Sphyrna), Squalidae (Squaliolus, Etmopterus, Isistius), Dasyatidae (Dasyatis) and Mobulidae (Mobula). Abundance, reproduction and other biological aspects of some of the species are presented.

Resumo. Estudou-se os elasmobrânquios capturados pelos atuneiros sediados em Santos. Esta frota, que utiliza o espinhel como arte de pesca, vem pescando desde 1968 no sudeste e sul do Brasil, sendo que em 1996 haviam 16 barcos, operando na área 17-35ºS,27-52ºW. Desde 1977 a produção de tubarões apresentou tendência crescente, atingindo 60% do total da captura em 1993. O cação-azul (Prionace glauca) foi o principal responsável pelo aumento das capturas de tubarões, representando cerca de 30 % do total da captura dessa frota. Identificou-se, no período de 1974 a 1997, 33 espécies de tubarão e duas de raia, pertencentes às seguintes famílias e gêneros: Alopiidae (Alopias), Carcharhinidae (Carcharhinus, Galeocerdo, Prionace) Hexanchidae (Heptranchias, Hexanchus), Lamnidae (Isurus, Lamna), Megachasmidae (Megachasma), Odontaspididae (Carcharias, Odontaspis), Pseudocarchariidae (Pseudocarcharias), Rhincodontidae (Rhincodon), Sphyrnidae (Sphyrna), Squalidae (Squaliolus, Etmopterus, Isistius), Dasyatidae (Dasyatis) and Mobulidae (Mobula). Apresentam-se análises da pesca, da reprodução e de outros aspectos biológicos de algumas espécies.



Full text doi:10.1071/MF97111

© CSIRO 1998

 
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