Title: Endogenous fishing mortalities: a state-space bioeconomic model
Authors: DA-ROCHA JOSÉ MARIAGARCÍA-CUTRÍN JAVIERGUTIÉRREZ MARÍA-JOSÉGAMITO JARDIM JOSÉ ERNESTO
Citation: ICES JOURNAL OF MARINE SCIENCE vol. 74 no. 9 p. 2437-2447
Publisher: OXFORD UNIV PRESS
Publication Year: 2017
JRC N°: JRC106531
ISSN: 1054-3139
URI: https://academic.oup.com/icesjms/article/74/9/2437/3823334
http://publications.jrc.ec.europa.eu/repository/handle/JRC106531
DOI: 10.1093/icesjms/fsx067
Type: Articles in periodicals and books
Abstract: A methodology that endogenously determines catchability functions that link fishing mortality with contemporaneous stock abundance is presented. We consider a stochastic age-structured model for a fishery composed by a number of fishing units (fleets, vessels or métiers) that optimally select the level of fishing effort to be applied considering total mortalities as given. The introduction of a balance constrain which guarantees that total mortality is equal to the sum of individual fishing mortalities optimally selected, enables total fishing mortality to be determined as a combination of contemporaneous abundance and stochastic processes affecting the fishery. In this way, future abundance can be projected as a dynamic system that depends on contemporaneous abundance. The model is generic and can be applied to several issues of fisheries management. In particular, we illustrate how to apply the methodology to assess the floating band target management regime for controlling fishing mortalities which is inspired in the new multi-annual plans. Our results support this management regime for the Mediterranean demersal fishery in Northern Spain.
JRC Directorate:Sustainable Resources

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