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Movement behaviour of skipjack (Katsuwonus pelamis) and yellowfin (Thunnus albacares) tuna at anchored fish aggregating devices (FADs) in the Maldives, investigated by acoustic telemetry

Published online by Cambridge University Press:  03 September 2012

Rodney Govinden ,
Riyaz Jauhary ,
John Filmalter ,
Fabien Forget ,
Marc Soria ,
Shiham Adam  and
Laurent Dagorn
Rodney Govinden
Affiliation:
Seychelles Fishing Authority (SFA), PO Box 449, Victoria, Mahé, Seychelles
Riyaz Jauhary
Affiliation:
Marine Research Centre, Ministry of Fisheries and Agriculture, Maldives
John Filmalter
Affiliation:
Institut de Recherche pour le Développement (IRD), UMR 212, PO Box 570, Victoria, Mahé, Seychelles South African Institute for Aquatic Biodiversity (SAIAB), Private Bag 1015, 6140 Grahamstown, South Africa
Fabien Forget
Affiliation:
Institut de Recherche pour le Développement (IRD), UMR 212, PO Box 570, Victoria, Mahé, Seychelles South African Institute for Aquatic Biodiversity (SAIAB), Private Bag 1015, 6140 Grahamstown, South Africa
Marc Soria
Affiliation:
Institut de Recherche pour le Développement (IRD), UMR 212, Parc Technologique Universitaire, PO Box 172, 97492, Sainte Clotilde Cedex, La Réunion, France
Shiham Adam
Affiliation:
Marine Research Centre, Ministry of Fisheries and Agriculture, Maldives
Laurent Dagorn*
Affiliation:
Institut de Recherche pour le Développement (IRD), UMR 212, PO Box 570, Victoria, Mahé, Seychelles
*
a Corresponding author: laurent.dagorn@ird.fr
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Abstract

The pole and line tuna fishery in the Maldives relies heavily on an array of 45 anchored fish aggregating devices (FADs), making it one of the largest anchored FAD-based tuna fisheries in the world. We examined the behaviour of skipjack (Katsuwonus pelamis) and yellowfin (Thunnus albacares) tuna around anchored FADs (1 000 to 2 000 m deep) in the Maldives using passive acoustic telemetry. Eight neighbouring FADs (distance range: 30 to 95 km, average: 50 km) were equipped with automated acoustic receivers in January 2009, for a period of 13 months. A total of 40 skipjack (37−54 cm FL) and 21 yellowfin (35−53 cm FL) tuna were tagged with Vemco V13 transmitters in January (start of the northeast monsoon, dry season) and November (end of the southwest monsoon, wet season) 2009 and released at the two central FADs within this instrumented array. No movement between FADs was observed for any acoustically-tagged tuna in the instrumented FAD array. These results suggest that FADs in the Maldives may act independently. The maximum time a tagged skipjack remained associated with a FAD was 12.8 days in January but only one day in November. In addition, residence times at FADs were found to differ with time (month) and space (FAD location) for skipjack tuna, suggesting that external biotic factors (e.g., prey, conspecifics or predators) might influence the time this species spends at FADs. In November, the residence times of yellowfin tuna (maximum observed time: 2.8 days) were three times greater than those of skipjack tuna at the same FADs. This specific difference could be explained either by the two species responding to different factors or by the species’ responses being dependent on the same factor but with different thresholds. No particular preference for time of departure from the FADs was observed. Some monospecific and multispecific pairs of acoustically-tagged individuals were observed leaving the FADs simultaneously. Thus, this study indicates a high degree of complexity in the behavioural processes driving FAD associations.

Keywords

BehaviourFish Aggregating DevicesPassive acoustic telemetrySkipjack tunaYellowfin tunaIndian Ocean
Type
Research Article
Information
Aquatic Living Resources , Volume 26 , Issue 1 , January 2013 , pp. 69 - 77
Copyright
© EDP Sciences, IFREMER, IRD 2012

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Footnotes

b

Present address : Centre de Recherche halieutique méditerranéen et tropical, BP 171, 34203 Sète Cedex, France

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