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| Bargain, R.M.; Lucas, V.; Thomas, A.. |
| The monofilament longline fishery targeting swordfish and tuna is practised actually in Seychelles by 8 local longliners (average length of 16 metres) and foreign longliners fishing under Seychelles licenses ( French and Indonesian longliners , averaging 34 metres and 25 metres in total length). Experimental trips by SFA’s research vessel were undertaken in 1994 and commercial trips started in 1995. The total landing catch increased from 215 mt in 1996 to 456 mt in 1999. The estimated catch rates varied from 0.64 kg/hook in 1996 to 0.92 kg/hook in 1999. Loss of catch due to predation by marine mammals (pseudorca crassidens) remains one of the major problem of this fishery. In 1999, 24 % of the total catch (109 mt of fish) was lost due to predation. The... |
| Tipo: Proceedings Paper |
Palavras-chave: Tuna fisheries; Swordfish fisheries; Longlining. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/850 |
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| Sabatié, R.; Marsac, F.; Hallier, J.P.; Potier, M.; Lucas, V.; Ménard, F.. |
| The trophic relations of two apex predators, yellowfin and bigeye tuna (Thunnus albacares and T. obesus), and their prey were investigated in the western tropical Indian Ocean. The contents of 173 non-empty stomachs were analysed from specimens caught with longlines and purse seine during scientific and fishing cruises. Diet data were processed by occurrence, by number, and by wet weight and a comparison of diets between surface and deep swimmers made. Crustaceans were the almost exclusive food source of surface-swimming bigeye tuna, with the stomatopod (Natosquilla investigatoris) being the sole prey item recorded in this category. The diet of deep-swimming yellowfin tuna was balanced between epipelagic fish, crustaceans and cephalopods. Bigeye tuna fed... |
| Tipo: Journal Contribution |
Palavras-chave: ANALYSIS; Diets; Tuna fisheries; Analysis; Tuna; Fisheries; Http://aims.fao.org/aos/agrovoc/c_8003; Http://aims.fao.org/aos/agrovoc/c_2934. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/1091 |
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