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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/70425 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/70425 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/70425 archive 351 disk0/00/01/07/17 2016-01-15 08:49:50 2021-08-27 17:23:49 2016-01-15 08:49:50 monograph show 3 Liu X. Heino M. 7602 0000-0003-2928-3940 pub iis_ecl prog_eep 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. 2013 published IR-13-046 IR-13-046 122 public interim_report IIASA, Laxenburg, Austria 16 FALSE info:eu-repo/semantics/book