Mitigating impacts of fishing on pelagic ecosystems
15-18 Oct 2012 Montpellier (France)
Monday 15

› 16:50 - 17:10 (20min)
› Auditorium
Using fishers' echosounder buoys for scientific studies
Jon Lopez  1@  , Gala Moreno  1@  , Guillermo Boyra, Marc Soria  2@  , Laurent Dagorn  3@  
1 : AZTI
Herrera Kaia - Portualdea z/g E-20110 Pasaia (Gipuzkoa) -  Spain
2 : Institut de Recherche pour le Développement  (IRD)
UMR 212
Av. J. Monnet, 34203, Sete -  France
3 : Institut de Recherche pour le Développement  (IRD)
UMR 212, P.o. Box 570, Victoria -  Seychelles

Thousands of drifting Fish aggregating devices (DFADs) are world widely employed in the tropical tuna purse seiner (PS) fishery.  Those devices are actively monitored by satellite linked buoys and most of them are equipped with echosounders which provides fishers with accurate geolocation information and some unbalanced biomass estimations. We believe that these instrumented buoys could be improved, in particular using knowledge on the vertical behavior of the different species found around FADs. In this work, we propose a multispecific biomass echo-integration. Using tagging and catch data, we provide estimates of aggregated biomass (in tons) by species (or groups of species, e.g. bycatch). With those improvements, echosounder buoys could be used as observatories for pelagic fish.     

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