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	Provedor de dados OceanDocs (2) Autor Conand, F. (2) Cayré, P. (1) Marsac, F. (1) Stequert, B. (1) Palavra-chave Indian Ocean (2) Age Growth rate Fishery biology Otolith ISW (1) Tuna fisheries Fishery surveys Tagging Sonic tags Local movements Migrations Environmental conditions Thunnus albacares ISW (1) Tipo do documento Proceedings Paper (2) Ano 1998 (1) 1996 (1) País Belgium (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Preliminary studies of age and growth of bigeye tuna (Thunnus obesus) in the western Indian Ocean. OceanDocs Stequert, B.; Conand, F.. The age and growth of Bigeye tuna from the western Indian Ocean was investigated using both otolith and first dorsal spine. Microincrements, considered as daily depositions , were observed on transverse section of sagittal otoliths of 154 bigeye tuna (Thunnus obesus); they were counted to determine age and establish growth curve. The von Bertalanffy growth curve is FL = 303.9 (1 – e-0.000397 ( t+167.15)), where FL is fork length in cm and t in days. The fish reaches 58 cm at 1 year, 91 cm at 2 years and 120 cm at 3 years of age. We also studied growth by analysing marks on the first dorsal spine of 140 fish. For fish which are 1 and 2 years old, the results obtained with spine and otoliths are comparable, but they are different for older fish . 'Research... Tipo: Proceedings Paper Palavras-chave: Age Growth rate Fishery biology Otolith ISW; Indian Ocean. Ano: 1998 URL: http://hdl.handle.net/1834/71 Analysis of small-scale movements of yellowfin tuna around fish-aggregating devices (FADS) using sonic tags OceanDocs Marsac, F.; Cayré, P.; Conand, F.. The ongoing ultrasonic experiments of phase 2 of the Regional Tuna Project (Commission de l'Ocean Indien) are reported and analysed in relation to the local environmental parameters. Although 7 yellowfin tuna (Thunnus albacares) were tagged during the first 3 cruises of the project, only 5 of them are considered in this paper, as they were tracked around FADs. Seasonal trends affect the horizontal movements associated with FADs: strong association and homing behaviour during the fishing season vs. weaker association when the fishing season comes to an end and the fish start migrating from the area. The vertical movements are analysed in order to provide a typology of the distribution of tuna in relation to different features (FAD association by day and at... Tipo: Proceedings Paper Palavras-chave: Tuna fisheries Fishery surveys Tagging Sonic tags Local movements Migrations Environmental conditions Thunnus albacares ISW; Indian Ocean. Ano: 1996 URL: http://hdl.handle.net/1834/16 Registros recuperados: 2 Primeira ... 1 ... Última

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