This conference aims to take stock of the exploitation of large pelagic fish using anchored and drifting FADs in the world.
28 Nov-2 Dec 2011 Arue (French Polynesia)
Wednesday 30
3- Understanding the phenomenon of aggregation

› 11:10 - 11:30 (20min)
› Endeavour
Temporal patterns of small and large pelagic fish species under drifting and anchored FADs
Manuela Capello  1, @  , Marc Soria  1, *, @  , Laurent Dagorn  1, @  , Kim Holland  2, @  , Sunil Panray Beeharry  3, @  , Fabien Forget  4, 6, @  , John Filmalter  5, 4, @  
1 : Institut de Recherche pour le Développement  (IRD)
UMR 212
Av. J. Monnet, 34203, Sete -  France
2 : Hawaii Institute Of Marine Biology
University Of Hawaii -  États-Unis
3 : Ministry of fisheries of Mauritius and Rodrigues
Mauritius -  Maurice
4 : Institut de Recherche pour le Développement  (IRD)
UMR 212, P.o. Box 570, Victoria -  Seychelles
6 : South African Institute for Aquatic Biodiversity  (SAIAB)
Grahamstown , South Africa -  Afrique du Sud
5 : South African Institute for Aquatic Biodiversity  (SAIAB)
Private Bag 1015, Grahamstown, 6140 -  Afrique du Sud
* : Corresponding author
We assessed telemetry data collected during experiments carried out in Reunion Island, Hawaii, Mauritius and in the Mozambique channel. The experimental protocol was similar between the different areas, consisting of passive monitoring of various species tagged with acoustic tags around drifting or anchored FADs.. Acoustic transmitters were internally implanted in the studied individuals. In order to characterize the periodicity of visits to FADs we analyzed and compared the temporal patterns of different species know to associate with FADs: small pelagic fishes included the bigeye scad (Selar Chrumenophtalmus) and the oceanic trigger fish (Canthidermis maculatus), and large pelagic fishes included tunas (yellowfin, skipjack and bigeye tuna), silky shark (Carcharhinus falciformis), wahoo (Acamthocybium solandrii) and rainbow runner (Elagatis bipinnulata). We found periodicity in a subset of individuals of all the species and identified a diel pattern, with fish aggregating closer during the day and performing excursions at night. We investigated the consequences of this pattern on the exploratory capabilities of each species. We discussed the intra and inter specific variability in view of the knowledge on releasing factors involved in animal rhythms.
Subject : : oral
Language of text : English
Topics : 3- Understanding the phenomenon of aggregation
Keywords : associated behaviour ; diel rhythm ; FAD
PDF version :  PDF version
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