FN Archimer Export Format
PT J
TI Daily and seasonal estimates of the recruitment and biomass of glass eels runs (Anguilla anguilla) and exploitation rates in the Adour open estuary (Southwestern France)
BT 
AF BRU, Noelle
   PROUZET, Patrick
   LEJEUNE, Michel
AS 1:1;2:2;3:3;
FF 1:;2:PDG-DPCP;3:;
C1 Univ Pau & Pays Adour, CNRS, Lab Math & Applicat, UMR 5142, F-64013 Pau, France.
   IFREMER, Lab Ressources Halieut Aquitaine, Anglet, France.
   BSHM, Lab Stat & Anal Donnees, F-38040 Grenoble 09, France.
C2 UNIV PAU & PAYS ADOUR, FRANCE
   IFREMER, FRANCE
   BSHM, FRANCE
SI ANGLET
SE PDG-DPCP
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.227
TC 12
UR https://archimer.ifremer.fr/doc/00000/11170/7526.pdf
LA English
DT Article
DE ;Biomass estimates;Exploitation rate;Time series;River;Glass eel;Anguilla anguilla
AB The European eel (Anguilla anguilla) is drastically declining in all its distribution area and listed in the red list of the IUCN (International Union for Conservation of Nature). A rebuilding plan was adopted at European level in 2007, Regulation R(CE) 100/2007, to restore eel abundance to the level observed during the seventies. Its implementation started on the 1(st) of January 2009. This species is heavily threatened by numerous activities including fishing, and its management can only be effective through a systemic approach minimizing the whole range of human-induced impacts on the resource and its habitat. In the framework of the European interregional programme INTERREG IIIB-Atlantic Area-the INDICANG project aimed at elaborating abundance indicators of the European eel in the central part of its distribution area (http://www.ifremer/fr/indicang/). A methodological guide was elaborated by this project to define the indicators needed for this resource assessment. In this framework, Ifremer (Institut Francais pour l'Exploitation de la Mer) and the UPPA University (Universite de Pau et des Pays de l'Adour) have developed a method to estimate the daily and seasonal biomass of glass eels with the view to evaluate the fishery's impact on the estuarine eel recruitment to the Adour catchment. The estimation method uses observations from nightly scientific surveys to estimate glass eels' densities in the water column during various flood tides characterized by different hydrodynamic conditions. Information on these conditions allows the estimation of the glass eels biomass migrating during the night. From these estimates and reported catches made by the fishery during the same night, the exploitation rate applied by the fishery on the flow of glass eels progressing upstream during night flood tides is estimated. The relationship between the exploitation rate, fishery catches and hydrodynamic conditions allowed the estimation of the exploitation rate and nocturnal biomass fluctuations during the fishing season, from November 1(st) to March 31(st) of the following year. Finally, from the chronological series of biomass migrating at night, the total biomass migrating every day and the total recruitment into the estuary, during the main glass eel migration period, are estimated. Estimations made between 1998 and 2005 indicate that the overall rate of exploitation of the marine and continental fisheries, on average, is of 15.7%, ranging between 8 and 25% according to fishing seasons.
PY 2009
PD OCT
SO Aquatic Living Resources
SN 0990-7440
PU Edp Sciences S A
VL 22
IS 4
UT 000274527800009
BP 509
EP 523
DI 10.1051/alr/2009050
ID 11170
ER

EF