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Limited impact of big fish mothers for population replenishment

Author:
Andersen, Ken H., Jacobsen, Nis Sand, van Denderen, P. Daniël
Source:
Canadian journal of fisheries and aquatic sciences 2019 v.76 no.3 pp. 347-349
ISSN:
1205-7533
Subject:
Gadus morhua, demography, females, fish, meta-analysis, mothers, reproductive performance
Abstract:
A recent meta-analysis by Barneche et al. (2018; Science, 360(6389): 642–645) shows that fish reproductive output scales hypergeometrically with female weight. This result challenges the common assumption that reproductive output is proportional to weight. The implication made is that current theory and practice severely underestimate the importance of larger females for population replenishment. Their example for cod (Gadus morhua) shows that current practice makes an error of 149%. By properly accounting for fish demography, we show that the error is maximally on the order of 10% and in most other fish stocks likely much less.
Agid:
6439766