Title: Estimators of discards using fishing effort as auxiliary information with an application to Iberian hake (Merluccius merluccius) exploited by the Portuguese trawl fleets
Authors: GAMITO JARDIM JOSÉ ERNESTOFERNANDES Ana Cláudia
Citation: FISHERIES RESEARCH vol. 140 p. 105-113
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2013
JRC N°: JRC69118
ISSN: 0165-7836
URI: http://www.sciencedirect.com/science/article/pii/S0165783612003505
http://publications.jrc.ec.europa.eu/repository/handle/JRC69118
DOI: 10.1016/j.fishres.2012.12.006
Type: Articles in periodicals and books
Abstract: Estimating discards is an important issue for fisheries management so that total mortality caused by fishing is considered. In 2003, a sampling programme addressing Iberian hake discards by the Portuguese fleets was implemented according to the requirements of the European Commission Data Collection Regulation (Reg. EC No 1543/2000). A preliminary analysis of the data collected showed trip and haul duration to be potential sources of bias, because their relationship to discards per unit effort (DPUE) was not linear. This paper develops estimators for discards by weight using fishing effort as auxiliary information, describes a jack-knife procedure to identify influential observations, applies the methodologies to Iberian hake as a case study and compares the results obtained by each estimator.
JRC Directorate:Space, Security and Migration

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