Identification of métiers based on economic and biological data: The Spanish bottom otter trawl fleet operating in non-Iberian European waters
MetadataShow full item record
AuthorsCastro, J. (José); Marín-González, M. (Manuel); Pérez-Contreras, M.N. (María Nélida); Pierce, G.J. (Graham John); Punzón, A. (Antonio)
Multivariate regression tree
Spanish bottom otter trawl (OTB) métiers within the North-eastern Atlantic (ICES Subareas VI, VII, and Divisions VIIIabd) have been identified through the application of multivariate analyses of landing profiles in terms of value (economic data) and total catches (biological data) over the period 2004–2006. The economic data uses information taken from logbooks and auctions for the period 2004–2006; while biological data is based on information taken from on-board sampling carried out in the same period. In order to identify métiers (homogeneous groups of fishing activity), a three-step process has been applied. Firstly, multivariate regression trees (MRT) are applied to obtain homogeneous groups which explain the inner structure of data by means of independent variables. Secondly, a list of specialized vessels is derived from each group obtained. Finally, an interview program is carried out with a representative number of skippers selected from the specialized vessels, who were asked ...