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Joint use of echosounding, fishing and video techniquesto assess the structure of fish aggregations around mooredFish Aggregating Devices in Martinique (Lesser Antilles)

Published online by Cambridge University Press:  23 January 2008

Mathieu Doray ,
Erwan Josse ,
Paul Gervain ,
Lionel Reynal  and
Josselin Chantrel
Mathieu Doray
Affiliation:
IRD/Ifremer, US Acoustique halieutique, Centre IRD de Bretagne, BP 70, 29280 Plouzané, France
Erwan Josse
Affiliation:
IRD, US Acoustique halieutique, Centre IRD de Bretagne, BP 70, 29280 Plouzané, France
Paul Gervain
Affiliation:
POLKA, Rue Authe 2, 97100 Basse-Terre, Guadeloupe
Lionel Reynal
Affiliation:
Ifremer, Laboratoire Ressources Halieutiques Antilles, Pointe Fort, 97321 Le Robert, Martinique
Josselin Chantrel
Affiliation:
Ifremer, Laboratoire Ressources Halieutiques Antilles, Pointe Fort, 97321 Le Robert, Martinique
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Abstract

From April 2003 to April 2004 monthly sea surveys were conducted around 2 fish aggregating devices (FADs) moored at 2000 and 2500 m depth in Martinique (Lesser Antilles). The use of a dual frequency splitbeam echosounder combined with an underwater camera and fishing methods allowed assessment of average space and time distribution of pelagic fish aggregated beneath the FADs, as well as identification of their overall size and species composition. At daytime, 4 fish aggregations were identified at each FAD, representing 4 distinct types: i) an aggregation of small juvenile tuna (mean fork length, FL: 30 cm) observed very close to the surface in 25% of daytime periods; ii) a small surface aggregation dominated by carangids, Caranx crysos, present in 65% of daytime periods; iii) a large sub-surface aggregation observed during all daytime periods: this aggregation appeared to be primarily comprised of 58 cm FL blackfin tuna (Thunnus atlanticus), mixed with yellowfin (Thunnus albacares) and skipjack (Katsuwonus pelamis) tunas of the same size; and iv) sub-surface scattered large predators (mainly blue marlin, Makaira nigricans) present in 10% of daytime periods. A smaller sub-surface aggregation comprised of medium tuna mixed with “extranatants” (fishes which remain within 10 to 50 m of a FAD) was observed in 75% of night-time periods, whereas unidentified scattered fishes were detected from 70 to 400 m depth. The low daytime vulnerability of medium sub-surface tunas to applied line techniques leads us to assume that their feeding motivation was low during daytime. These tunas could preferentially feed on mesopelagic organisms during night-time and transition periods around Martinican moored FADs. Local fishermen mainly targeted the large scattered predators using very small tunas as living bait. The sub-surface tuna aggregation hence appeared to be currently unexploited by local fisheries, though it represented the large majority of the pelagic biomass around the moored FADs.

Keywords

Fish aggregating deviceAcousticsUnderwater videoSmall scale fisheryAggregative behaviourTunaLesser Antilles
Type
Research Article
Information
Aquatic Living Resources , Volume 20 , Issue 4: Fish Aggregating Devices as Instrumented Observatories of Pelagic Ecosystems , October 2007 , pp. 357 - 366
Copyright
© EDP Sciences, IFREMER, IRD, 2008

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