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| Vialard, Jerome; Duvel, J. P.; Mcphaden, M. J.; Bouruet-aubertot, P.; Ward, Ben; Key, E.; Bourras, D.; Weller, Robert; Minnett, P.; Weill, A.; Cassou, C.; Eymard, L.; Fristedt, T.; Basdevant, C.; Dandonneau, Y.; Duteil, O.; Izumo, T.; De Boyer Montegut, Clement; Masson, S.; Marsac, F.; Menkes, C.; Kennan, S.. |
| A field experiment in the southwestern Indian Ocean provides new insights into ocean-atmosphere interactions in a key climatic region. |
| Tipo: Text |
Palavras-chave: Madden julian oscillation; Southwest indian ocean; Surface temperature; Mixed layer; Intraseasonal variability; Rainfall variability; Tropical cyclones; Western pacific; Dipole mode; El nino. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00185/29634/27990.pdf |
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| Marsac, F.; Le Blanc, J.-L.. |
| In this paper, the authors explore functional relationships between environmental fluctuations and some key parameters used in stock assessment such as recruitment and catchability. Yellowfin tuna (Thunnus albacares) is taken as an example but the concepts developed in this study could be widened to other tropical tunas. The French purse seine data-set is used to estimate a recruitment index from adjusted CPUE of age 0 fishes, and the effect of the environment on catchability is assessed using CPUE of age 3 fishes which provide the bulk of adult catches. The ACE algorithm is used to describe a non-linear relationship between the recruitment and the turbulence (wind speed cubed). There is a detrimental effect of an increasing turbulence on recruitment. The... |
| Tipo: Proceedings Paper |
Palavras-chave: Recruitment Catchability El Nino Phenomena Tuna fisheries Southern Oscillation Catch/effort Thunnus albacares ISW; Indian Ocean. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/51 |
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| Fonteneau, A.; Marsac, F.; Pianet, R.; Stequert, B.. |
| This document attempts to develop an overview of the future needs for tuna research that should be recommended by the IOTC. Because of the spectacular increase of the tuna catches in the Indian Ocean during the last 15 years, it is necessary to conduct active research on the major stocks, giving a high priority to all research that will allow a reliable assessment of the stock status. A general problem in the tuna research conducted in the Indian Ocean is the lack of large-scale tagging programs. Such programs should be a priority in future Indian Ocean tuna research. Other research should also be conducted simultaneously upon various biological parameters which are fundamental to stock assessment. The fishery associated with artificial floating objects,... |
| Tipo: Proceedings Paper |
Palavras-chave: Catch/effort Purse seining Catching method ISW; Indian Ocean. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/61 |
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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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