Distribution and size composition of marine turtles Caretta caretta and Dermochelys coriacea, interaction with pelagic longline fishing in the south Atlantic Distribucion y composicion de tallas de las tortugas marinas Caretta caretta y Dermochelys coriacea que interactual con el palangre pelagico en el Atlantico sur

Lopez-Mendilaharsu, M.; Sales, G.; Giffoni, B.; Miller, P.; Niemeyer Fiedler, F.; Domingo, A.

International Commission for the Conservation of Atlantic Tunas Collective Volume of Scientific Papers 60: 2094-2109

2007


Accession: 038153895

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Abstract
Throughout the world the incidental catch and mortality of sea turtles in pelagic longline represents a serious threat for these stocks. This problem has received more attention in recent years due to the current state of conservation of these species. This paper analyzes the information obtained between 1998 and 2005 from 1,729 sets carried out by observers on board the Brazilian and Uruguayan pelagic longline fleets that fish in the Atlantic Ocean. Observations were made of 2,643,851 hooks set, from 28deg. S to 38deg. S, where 1,693 Caretta caretta and 238 Dermochelys coriacea were caught. For C. caretta higher CPUE values were observed between 32deg. and 36deg. S and between 41-53deg. W and 29-33deg. W. A seasonal increase was observed in the number of catches of this species in the summer and autumn months. D. coriacea showed higher CPUE values in the area close to the slope (41-53deg. W), and higher catches were observed between May and August. Biometric data of individuals caught were collected when possible. The majority of the C. caretta turtles were mature individuals (average= 57.1 cm) and in the case of D. coriacea a predominance of adults was noted (average= 151.2 cm).