Effects of fishing on growth traits: a simulation analysis

Williams, Erik H. and Shertzer, Kyle W. (2005) Effects of fishing on growth traits: a simulation analysis. Fishery Bulletin, 103(2), pp. 392-403.

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Abstract—Fisheries often target individuals based on size. Size-selective fishing can create selection differentials on life-history traits and, when those traits have a genetic basis, may cause evolution. The evolution of life history traits affects potential yield and sustainability of fishing, and it is therefore an issue for fishery management. Yet fishery managers usually disregard the possibility of evolution, because little guidance is available to predict evolutionary consequences of management strategies. We attempt to provide some generic guidance. We develop an individual-based model of a population with overlapping generations and continuous reproduction. We simulate model populations under size-selective fishing to generate and quantify selection differentials on growth. The analysis comprises a variety of common life-history and fishery characteristics: variability in growth, correlation between von Bertalanffy growth parameters (K and L∞), maturity rate, natural mortality rate (M), M/K ratio, duration of spawning season, fishing mortality rate (F), maximum size limit, slope of selectivity curve, age at 50% selectivity, and duration of fishing season. We found that each characteristic affected the magnitude of selection differentials. The most vulnerable stocks were those with a short spawning or fishing season. Under almost all life-history and fishery characteristics examined, selection differentials created by realistic fishing mortality rates are considerable.

Item Type: Article
Title: Effects of fishing on growth traits: a simulation analysis
Personal Creator/Author:
Williams, Erik H.
Shertzer, Kyle W.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 103
Number: 2
Page Range: pp. 392-403
Date: 2005
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Item ID: 9623
Depositing User: Patti M. Marraro
Date Deposited: 01 Aug 2012 13:01
Last Modified: 04 Aug 2012 18:25
URI: http://aquaticcommons.org/id/eprint/9623

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