RIM17(6): A multivariate approach for metier definition: A case study of Basque Country trawlers

Author / Editor: Ane Iriondo, Raúl Prellezo, Marina Santurtún, Dorleta García, Iñaki Quincoces and Estanis Mugerza (AZTI-Tecnalia)

Year: 2010

Content: In this paper a classification into metiers of the trawling fleet of the Basque Country (North East of Spain) operating in the Northeast Atlantic ICES Subareas VI, VII, and Divisions VIIIa,b,d from 2003 to 2008 is presented. Principal Component Analysis (PCA) and Cluster analysis approach are used to obtain homogeneous groups of metiers using trip by trip catch data information. The characterization of these groups is based on target species, fishing area, gear and period of the year. After analyzing the clusters obtained and taking into account the knowledge of the fishery, seven Basque trawl metiers are proposed: 1) pair trawl in Divisions VIIIa,b,d targeting demersal fish, 2) otter trawl in Divisions VIIIa,b,d targeting demersal fish , 3) otter trawl in Divisions VIIIa,b,d targeting mixed cephalopods and demersal fish 4) otter trawl in Division VIIIa,b,d targeting horse mackerel, 5) otter trawl in Divisions VIIIa,b,d targeting mackerel, 6) otter trawl in Subarea VII targeting megrim and monkfish, 7) otter trawl in Subarea VI targeting hake, megrim and monkfish and seasonally blue ling. Five of them are considered consistent along the years 2003-2008 and two of them are seasonal.


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