Stéquert Bernard auteur aut IRD Marsac Francis auteur aut IRD text book eng text/pdf reformatted digital access Althought few data are available, Indian Ocean tuna resources are becoming the object of an increasingly active fishery. Between 1980 and 1985 catches grew from 275 000 t to almost 450 000 t, a 60% increase. Catches of tropical surface tuna species, mainly skipjack and yellowfin, nearly doubled during the same period, from 156 000 t to almost 300 000 t. The catch potential for these species is still largely unknow. This document summarizes present knowledge on the biology of the main species of tuna in the Indian Ocean, the oceanographic environment and its influence on production. The main artisanal fisheries are described country by country. Results of the many surveys carried out by pole-and-line fishing, with live bait, and purse seining or through aerial survey are analysed. These observations and the most recent results of commercial purse-seine fisheries give clear indications of those areas favourable to tuna surface concentration and consequently potential grounds for purse-seining and pole-and-line fishing. (Résumé d'auteur) specialized THON DISTRIBUTION SPATIALE REPRODUCTION NUTRITION ANIMALE CROISSANCE MIGRATION STOCK PECHE ARTISANALE TECHNIQUE DE PECHE ZONE DE PECHE RELATION ESPECE ENVIRONNEMENT OCEAN INDIEN MALDIVES INDE SRI LANKA INDONESIE THAILANDE MER ROUGE MADAGASCAR COMORES SEYCHELLES 040PECHE03 040PECHE02 Rome FAO 1989 282 237 237 237 https://www.documentation.ird.fr/hor/fdi:010006233 92-5-102490-1 [F A010006233] https://www.documentation.ird.fr/hor/fdi:010006233 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers16-03/010006233.pdf IRD - Base Horizon / Pleins textes 1996-08-01 2016-04-01 fdi:010006233 fre