3 documents found, page 1 of 1
Staining techniques for ageing tope shark, Galeorhinus galeus (Linnaeus, 1758),...
Duarte, Pedro N.; Silva, Alexandre A.; Menezes, Gui M.; Pinho, Mário RuiA vertebrae sample of tope shark, Galeorhinus galeus (Linnaeus, 1758), stratified by sizeclasses,was used to test between different staining techniques of enhancing vertebral growth ring visibility. Four techniques were tested: alizarin red, silver nitrate and cobalt nitrate staining, and the “deep-coned vertebrae” technique. The latter was discarded due to its unsuitability for tope shark vertebrae. The cobalt...
Impact of swordfish fisheries on sea turtles in the Azores.
Ferreira, Rogério L.; Martins, Helen R.; Silva, Alexandre A.; Bolten, Alan B.The surface longline fishery around the Azores targets swordfish (Xiphias gladius). Bycatch from this fishery includes loggerhead sea turtles (Caretta caretta) and occasionally leatherback sea turtles (Dermochelys coriacea) that are either hooked or entangled in the lines. Hooks are generally set at depths of 15-50 m and baited with squid, mackerel, or sometimes with shark meat. The size classes of loggerhead s...
First record of the spined pygmy shark, Squaliolus laticaudus (Smith & Radcliff...
Silva, Alexandre A.; Duarte, Pedro C.; Giga, Ana; Menezes, Gui M.A presente nota documenta a primeira observação do tubarão-anão, Squaliolus laticaudus (Smith & Radcliffe, 1912), nos Açores, estendendo a sua distribuição ocidental no Atlântico Nordeste até ao arquipélago. A ocorrência da espécie nos arquipélagos macaronésicos é igualmente discutida.; ABSTRACT: This paper reports the first observation of the spined pygmy shark, Squaliolus laticaudus, from the Azores, extendin...