FN Archimer Export Format
PT J
TI Notes on nine biological indicators estimable from trawl surveys with an illustrative assessment for North Sea cod
BT 
AF COTTER, John
   MESNIL, Benoit
   WITTHAMES, Peter
   PARKER-HUMPHREYS, Matt
AS 1:1;2:2;3:1;4:1;
FF 1:;2:PDG-DOP-DCN-EMH;3:;4:;
C1 Cefas, Lowestoft NR33 0HT, Suffolk, England.
   IFREMER, Dept EMH, F-44311 Nantes, France.
C2 CEFAS, UK
   IFREMER, FRANCE
SI NANTES
SE PDG-DOP-DCN-EMH
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 1.227
TC 17
UR https://archimer.ifremer.fr/doc/2009/publication-6901.pdf
LA English
DT Article
CR IBTS INTERNATIONAL BOTTOM TRAWL SURVEY (IBTS),
DE ;Ecosystem approach to fisheries management;Year class curves;Weight index;Maturity stage;Age composition;Length based indicators;Biological indicators
AB This paper reviews a selection of nine indicators for assessing the biological state of a fish population monitored only by using trawl surveys in which catchability is assumed constant from time to time and place to place. The intention is to inform or remind of the range of possibilities and of associated practical and statistical issues. The indicators, grouped according to relationships with abundance, length, age, weight, and reproduction, are documented in a standard format covering estimation, interpretability, sensitivity, considerations for reference points where possible, and an example of their application. Lastly, selected indicators together with year-class curves fitted to abundance indices-at-age are applied to the North Sea cod to demonstrate the feasibility of an assessment based on only one trawl survey. Results support findings of the International Council for the Exploration of the Sea (ICES) working group on the assessment of demersal stocks in the North Sea and Skagerrak.
PY 2009
PD APR
SO Aquatic Living Resources
SN 0990-7440
PU EDP Sciences
VL 22
IS 2
UT 000267128000004
BP 135
EP 153
DI 10.1051/alr/2009016
ID 6901
ER

EF