A rough guide to population change in exploited fish stocks

Authors
Citation
R. Cook, A rough guide to population change in exploited fish stocks, ECOL LETT, 3(5), 2000, pp. 394-398
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
ECOLOGY LETTERS
ISSN journal
1461-023X → ACNP
Volume
3
Issue
5
Year of publication
2000
Pages
394 - 398
Database
ISI
SICI code
1461-023X(200009)3:5<394:ARGTPC>2.0.ZU;2-S
Abstract
Interpreting how populations will change in response to exploitation is ess ential to the sound management of fish stocks. While deterministic models c an be of use in evaluating sustainable fishing rates, the inherent variabil ity of fish populations limits their value. In this paper a probabilistic a pproach is investigated which avoids having to make strong assumptions abou t the functional relationship between spawning stock size and the annual nu mber of young fish (recruits) produced. Empirical probability distributions for recruits are derived, conditioned on stock size, and used to indicate likely stock changes under different fishing mortality rates. The method is applied to cod (Gadus morhua) in the North Sea to illustrate how populatio n change can be inferred and used by fishery; managers to choose fishing mo rtality rates which are likely to achieve sustainable exploitation.