FN Archimer Export Format
PT J
TI A method for controlled target strength measurements of pelagic fish, with application to European anchovy (     Engraulis encrasicolus     )
BT 
AF DORAY, Mathieu
   BERGER, Laurent
   LE BOUFFANT, Naig
   COAIL, Jean-Yves
   VACHEROT, Jean-Philippe
   DE LA BERNARDIE, Xavier
   MORINIERE, Pierre
   LYS, Elisabeth
   SCHWAB, Romain
   PETITGAS, Pierre
AS 1:1;2:2;3:2;4:3;5:4;6:5;7:6;8:5;9:2;10:1;
FF 1:PDG-RBE-EMH;2:PDG-IMN-NSE-ASTI;3:PDG-IMN-NSE-ASTI;4:PDG-REM-RDT-SI2M;5:PDG-RBE-STH-LTBH;6:;7:;8:;9:PDG-IMN-NSE-AS;10:PDG-RBE-EMH;
C1 Ifremer Nantes, Unite Ecol & Modeles Halieut, Rue Ile dYeu,BP 21105, F-44300 Nantes 3, France.
   Ifremer Brest, Serv Acoust Sous Marine & Traitement Informat, Brest, France.
   Ifremer Brest, Serv Ingn & Instrumentat Marine, Brest, France.
   Ifremer Lorient, Lab Technol & Biol Halieut, Lorient, France.
   Univ Nantes, Ecole Mines Nantes, CNRS IN2P3, UMR SUBATECH, Nantes, France.
   Aquarium La Rochelle, La Rochelle, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   UNIV NANTES, FRANCE
   AQUARIUM LA ROCHELLE, FRANCE
SI NANTES
   BREST
   LORIENT
SE PDG-RBE-EMH
   PDG-IMN-NSE-ASTI
   PDG-REM-RDT-SI2M
   PDG-RBE-STH-LTBH
   PDG-IMN-NSE-AS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 2.76
TC 6
UR https://archimer.ifremer.fr/doc/00346/45693/45623.pdf
LA English
DT Article
CR PELGAS
DE ;acoustics;deformed cylinder model;Engraulis encrasicolus;remotely operated vehicle;target strength;video
AB Measuring fish target strength (TS) in the wild is challenging because: (i) TS varies versus physical (orientation relative to the incident sound wave, size, and depth) and physiological fish attributes (maturity and condition), (ii) the target species and its aforementioned attributes are difficult to assess in near real time, and (iii) in the case of packed fish schools, accepted echoes may originate from multiple unresolved targets. We propose a method for controlled TS measurements of densely packed small pelagic fish during daytime, based on the joint use of a Remotely Operated Towed Vehicle, “EROC”, with a pelagic trawl fitted with a codend opening system, “ENROL”. EROC, equipped with a 70-kHz split-beam echosounder (Simrad EK60) and a low-light black and white camera, can be moved inside the fishing trawl. Pelagic fish are funnelled into the open trawl and their TS is measured in the middle of the net, where small groups actively swim towards the trawl mouth. The swimming behaviour allows for near-dorsal TS to be measured, minimizing the large effect of incidence angle on TS variability. The EROC camera, located near the open codend, provides optical identification of the species. This method was used to measure the TS of European Anchovy, Engraulis encrasicolus in the Bay of Biscay during 2014. The mean, near dorsal TS was −43.3 dB, for a mean fork length of 12.5 cm. This value is compared to published values of clupeiforms mean TS obtained for a range of natural incidence angles and discussed in the light of TS modelling results obtained for E. encrasicolus.
PY 2016
PD SEP
SO Ices Journal Of Marine Science
SN 1054-3139
PU Oxford Univ Press
VL 73
IS 8
UT 000384300700005
BP 1987
EP 1997
DI 10.1093/icesjms/fsw084
ID 45693
ER

EF