FN Archimer Export Format
PT Rapport
TI EU purse seine fishery interaction with marine turtles in the Atlantic and Indian Oceans: a 15 years analyses
BT 
AF CLERMONT, Sandra
   CHAVANCE, Pierre
   DELGADO DE MOLINA, Alicia
   MURUA, Hilario
   RUIZ, Jon
   CICCIONE, Stephane
   BOURJEA, Jerome
AS 1:1,2,3;2:4;3:5;4:6;5:6;6:2;7:1;
FF 1:;2:;3:;4:;5:;6:;7:PDG-RBE-DOI;
C1 IFREMER, Institut Français de recherche pour l’exploitation de la Mer, Délégation de l’Océan Indien, France
   KELONIA, l’observatoire des Tortue marine de La Réunion, France
   AgroParisTech, Institut des sciences et industries du vivant et de l’environnement, France
   IRD, Institut de Recherche pour le Développement, France
   IEO, Instituto Español de Oceanografía, Spain
   AZTI Tecnalia, Spain
C2 IFREMER, FRANCE
   KELONIA, FRANCE
   AGROPARISTECH, FRANCE
   IRD, FRANCE
   IEO, SPAIN
   AZTI, SPAIN
SI SETE
   LA REUNION
SE IRD
   PDG-RBE-DOI
UR https://archimer.ifremer.fr/doc/00149/25991/24087.pdf
LA English
DT Report
DE ;European tuna fishery;purse seine;marine turtle;bycatch;Atlantic and Indian Oceans
AB Bycatch of marine turtles, vulnerable or endangered species, is a growing issue of all fisheries, including Oceanic purse-seine fishery. The present paper seeks to assess marine turtle bycatch at a spatial and temporal level in the European purse seine fishery operating in the Atlantic and Indian Oceans. The study was based on data collected through French and Spanish observer programs from 1995 to 2011, a period where more than 230 000 fishing sets were realized by the UE fleets in both Oceans. A total of 15 913 fishing sets were observed, including 6 515 on drifting Fish Aggregate Devices (FAD) and 9 398 on Free Swimming Schools (FSC). Over the study period, 597 turtles were caught, 86% being released alive at sea. At the same time, from 2003 to 2011, 14 124 specific observations were carried out on floating objects whether they ended in a set or not. 354 marine turtles were observed upon which 80% were already free or entangled alive and therefore released alive. At the temporal and spatial level, data were organized and analysed by Ocean, fishing mode (FAD vs. FSC) as well as by year, quarter and statistical square of 1°. In order to evaluate the impact if this fishery in both Oceans, bycatch distribution was compared to the total fishing effort of the UE fleet, as well as to the known marine turtle post nesting migration routes, nesting population abundances and known feeding areas. The species composition, the size and sex structure of bycatch are also discussed here. At last, an attempt to raise the data to the total fishing effort was carried out. Based on observation of marine turtle by-catches on sets, we estimated that, globally, 3500 marine turtles were accidentally captured by the EU-PS fleet in the Atlantic Ocean from 1995 to 2010, and around 2000 in the Indian Ocean from 2003 to 2010, with a corresponding annual bycatch rate of 218 (SD=150; survival rate =91%) and 250 (SD=157; survival rate =77%) respectively in the Atlantic and Indian Ocean. However, because of important uncertainties mainly due to the low observation coverage and the scarcity of marine turtle bycatch events, it was impossible to produce solid and reliable global estimates of marine turtle bycatch and mortality due to PS activity.
PY 2012
PD SEP
ID 25991
ER

EF