FN Archimer Export Format
PT J
TI Estimating end effects in trawl catches
BT 
AF BATTAGLIA, Andre
   TRENKEL, Verena
   ROCHET, Marie-Joelle
AS 1:2;2:1;3:1;
FF 1:;2:;3:;
C1 IFREMER, Dept EMH, F-44311 Nantes 03, France.
   IFREMER, Dept HGS, F-17137 Lhoumeau, France.
C2 IFREMER, FRANCE
   IFREMER, FRANCE
IN WOS Ifremer jusqu'en 2018
IF 1.469
TC 7
UR https://archimer.ifremer.fr/doc/2006/publication-1686.pdf
LA English
DT Article
CR ORHAGO 14
   ORHAGO6-1
BO Antea
   Gwen Drez
DE ;Trawl survey;Bias;Abundance index
AB The end effect in trawl catches is defined as the proportion of the fish catch taken during shooting and hauling of the net, a period excluded from that nominally referred to as haul duration. If important, this effect will lead to biased abundance estimates, because the swept area will be underestimated. An experimental survey was carried out to compare catch numbers obtained in standard research 30-min hauls with those from 0-min hauls, the latter referring to the trawl being hauled as soon as the trawl geometry stabilized on the seabed. Average catch ratios (0-min/30-min hauls) ranged from 0.05 (s.d. 0.06) for sole to 0.34 (s.d. 0.64) for hake, indicating that the end effect might be more important and more variable for highly mobile species. As a consequence, the bias in abundance indices derived from swept area estimates that ignore end effects will be species-dependent. (c) 2006 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved.
PY 2006
PD JUL
SO ICES Journal of Marine Science
SN 1054-3139
PU Elsevier
VL 63
IS 5
UT 000238483300019
BP 956
EP 959
DI 10.1016/j.icesjms.2006.03.002
ID 1686
ER

EF