Overlooked biological and economic implications of within-season fishery dynamics

Author:

Liu Xiaozi1,Heino Mikko2

Affiliation:

1. Norwegian School of Economics, Helleveien 30, N-5045 Bergen, Norway.

2. Department of Biology, University of Bergen, Box 7803, N-5020 Bergen, Norway; Institute of Marine Research, Box 1870 Nordnes, N-5817 Bergen, Norway; International Institute for Applied Systems Analysis (IIASA), A-2361 Laxenburg, Austria.

Abstract

Catch equations relate fisheries catch to initial fish abundance and the applied fishing pressure. The Baranov catch equation, often simply referred to as the catch equation, is the commonest one. However, there are exactly three ways of describing seasonal progression of fishing parsimoniously with a single parameter: assume catch rate, fishing effort, or fishing mortality is constant, the last being the assumption underlying the Baranov catch equation. These assumptions imply different dynamics, and only in special cases two of these assumptions can hold true simultaneously. Whether this happens is dictated by the concentration profile (i.e., the dependence of mean fish density where fishing takes place on total stock abundance). We show that the assumed seasonal progression of fishing and the type of the concentration profile have major implications for fishery dynamics as well as biological and economic consequences of fishing, calling for increased awareness of these overlooked assumptions of fishery dynamics. However, in many cases the Baranov catch equation serves as a good approximation, even when its assumption of constant fishing mortality is violated.

Publisher

Canadian Science Publishing

Subject

Aquatic Science,Ecology, Evolution, Behavior and Systematics

Reference23 articles.

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2. Beverton, R.J.H., and Holt, S.J. 1957. On the dynamics of exploited fish populations. Fishery Investigations Series II Vol. XIX. Ministry of Agriculture, Fisheries and Food, London.

3. Differences in predicted catch composition between two widely used catch equation formulations

4. Clark, C.W. 1982. Concentration profiles and the production and management of marine fisheries. In Economic theory of natural resources. Edited by W. Eichhorn, R. Henn, K. Neumann, and R.W. Shephard. Physica-Verlag, Würzburg-Wien. pp. 97–112.

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