Éditeur(s) : Elsevier
Résumé : This paper examines the fishing of blackfin tuna (Thunnus atlanticus) around Fish Aggregating Devices (FADs) in Martinique (French West Indies). It is based on the compared analysis of catches from monthly experimental fishing surveys and sampling of commercial landings. The data collected in these two different ways allowed comparison of blackfin tuna length frequencies. A large part of the commercial landings were made up of young immature tuna with a fork length of less than 40 cm, whereas the experimental longline catches were mainly made up of fish with a fork length ranging between 55 and 75 cm. We give evidence that these discrepancies were mostly due to the fishing technique used. Indeed, contrarily to the experimental surveys, Martinican fishermen only fish during daytime and usually on the surface by trolling. This way, fishermen do not have access to the largest fish, which are found deeper. Out results suggested that a new fishing technique such as vertical longlining, could improve commercial catches of big blackfin tuna under FADs. (C) 2000 Ifremer/CNRS/INRA/IRD/Cemagerf/Editions scientifiques et medicales Elsevier SAS.
Aquatic Living Resources (0990-7440) (Elsevier), 2000-07 , Vol. 13 , N. 4 , P. 259-262

Droits : 2000 Ifremer/CNRS/INRA/IRD/Cemagref/Éditions scientifiques et médicales Elsevier SAS
http://archimer.ifremer.fr/doc/2000/publication-1392.pdf
DOI:10.1016/S0990-7440(00)01056-1
http://archimer.ifremer.fr/doc/00000/1392/

Éditeur(s) : Pêche thonière et dispositifs de concentration de poissons, Caribbean-Martinique, 15-19 Oct 1999
Résumé : More than ten years after its launching, an evaluation of the results of the FADs programme carried on in Reunion Island has been made. Its implementation and its impact on artisanal fishery in Reunion Island have been analysed. This analysis demonstrates that, following a continuously ascending phase, the production of fish caught on fads has reached a plateau. Parallel to the FAD-associated fishery, the longline fishery has developed since 1991. This type of fishery includes production units whose operating zone is bordering the FAD installation area. Analysing the evolution of the small longliner sector is based on general activity indicators (number of ships, production, fish selling prices). Besides, a synthesis of the interactions between those two types of fisheries, whether in terms of exploited resources, space conflicts, fishing population or market, has been effected. Judging from the complementary and antagonistic natures of the two fisheries identified above and given their evolution, the future of the FADs programme is pending. Have the fads just been a step in the evolution of the Reunion fishing system or have they modified it on a long-term basis?

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00042/15319/12640.pdf
http://archimer.ifremer.fr/doc/00042/15319/

Éditeur(s) : Pêche thonière et dispositifs de concentration de poissons, Caribbean-Martinique, 15-19 Oct 1999
Résumé : The length frequency distribution of blackfin tunas (Thunnus atlanticus) shows a significant difference between fishes caught with a longline, during Ifremer experimental surveys and fishes landed by fishermen who exploit martinican FADs. The fishing technique used could probably explain this. In fact, diving surveys have confirmed the presence of great concentrations of adult blackfin tunas under FADs. Big individuals stay during long periods between 20 and 50 meters under the FAD while small ones go up to the surface to feed on little flying fishes, at dawn principally. The bait and the line used at the moment around martinican FADs do not fit to adult blackfin tunas fishing. From these observations and following the tests realized by Ifremer in La Reunion in 1990, we proposed to martinican fishermen to test a new technique based on the utilization of live bait locally called "coulirous" (Selar crumenophthalmus). In La Reunion, this technique has been successful. Live baits are hooked on a vertical longline. In Martinique, the tests to catch live bait during the night near the shore have been already successful and the first fishing experiences with vertical line are also encouraging. This paper aims at proposing and transfering this technique to martinican fishermen but technical exchanges and discussions are needed to improve this new fishing technique.Original Abstract: Une analyse des compositions en taille des thons noirs (Thunnus atlanticus) captures, d'une part, lors des peches experimentales realisees par l'Ifremer a la palangre derivante et, d'autre part, debarques par les pecheurs exploitant les DCP martiniquais montre une difference significative de la taille moyenne des individus. Les techniques de peche utilisees peuvent probablement expliquer cette difference. En effet, des observations sous-marines ont confirme a plusieurs reprises la presence de larges concentrations de thons noirs adultes sous les dispositifs. Les gros individus se tiennent preferentiellement entre 20 et 50 m de profondeur a proximite du DCP alors que les petits individus montent plus frequemment en surface pour chasser, notamment au lever du jour. L'appat et les caracteristiques des engins actuellement utilises autour des DCP martiniquais ne sont pas bien adaptes a la capture des thons noirs adultes. A partir de ce constat et sur la base des essais de palangres verticales realises au laboratoire de l'Ifremer de La Reunion en 1990, qui ont abouti a une generalisation de cette technique de peche autour des DCP reunionnais, nous avons propose aux pecheurs martiniquais de tester cette nouvelle technique basee sur l'utilisation de " coulirous " vivants (Selar crumenophthalmus). Les essais de peche de l'appat vivant, la nuit a la palangrotte, se sont reveles positifs dans plusieurs baies de la Martinique et les premiers tests sur la palangre verticale a thons noirs sont encourageants. Cette communication fait le point sur le transfert vers les pecheurs martiniquais en identifiant les mises au point necessaires pour ameliorer l'efficacite de la technique proposee.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00042/15293/12651.pdf
http://archimer.ifremer.fr/doc/00042/15293/

Éditeur(s) : Pêche thonière et dispositifs de concentration de poissons, Caribbean-Martinique, 15-19 Oct 1999
Résumé : Over the last 16 years, the Secretariat of the Pacific Community (SPC - formerly the South Pacific Commission) has been developing and providing information on mid-water fishing techniques targeting the larger, deeper-swimming tunas that aggregate around FADs. SPC masterfishermen have conducted in-country fishing trials to test methods, such as vertical longlines, and train local fishermen in their construction and use. Vertical longline catch rates have varied considerably due to a range of reasons with no catches reported in some locations, or just sharks, to highs of over 6.5 kg /10 hooks/hour being recorded in other locations. Other methods like drop-stone, palu-ahi, and single-hook drifting lines have been developed within the region, with SPC adopting and transferring this technology to other locations. To further disseminate this information, SPC has recently published a technical manual outlining a range of mid-water fishing gears and techniques that can be used in association with FADs. An outline of the main gears and techniques with catch data where available is presented, with factors influencing catches discussed based on the findings of SPC masterfishermen over the years.

Droits : info:eu-repo/semantics/openAccess
http://archimer.ifremer.fr/doc/00042/15295/12653.pdf
http://archimer.ifremer.fr/doc/00042/15295/