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|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 ERNESTO; FERNANDES Ana Cláudia|
|Citation:||FISHERIES RESEARCH vol. 140 p. 105-113|
|Publisher:||ELSEVIER SCIENCE BV|
|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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