Identification of métiers of the Spanish set-longline fleet operating in non-Spanish European waters

Identification of métiers based on economic and biological data: The Spanish bottom otter trawl fleet operating in non-Iberian European waters

“…This scenario was explored in a preliminary fleet-based management analysis (Castro, 2011), where these OTB métiers were analyzed together with the Spanish longline métiers (Castro et al, 2011b) and the monosepecific (targeting hake) Spanish pair trawl and gillnet fisheries (Castro et al, 2011a) operating in the study area. Obviously, the development of this work requires the inclusion of all international métiers operating in the area, especially those from coastal countries.…”

“…The identification of métiers was carried out following the 3-step process described by Castro et al (2011b). First, a multivariate analysis was carried out on both economic and biological data to obtain homogenous groups of fishing activity (clusters).…”

“…Thus, the so-called automatic classification procedures, provided with more computational power and objective quality indices, also began to be applied on large sets of fishery data (e.g. Duarte et al, 2009;Castro et al, 2011b).…”

Definition, dynamics and stability of métiers in the Irish otter trawl fleet

“…Alternative approaches such as Partitioning Around Medoids (PAM) algorithm (Duarte et al, 2009) and an extension of this for large datasets, CLARA (Clustering LARge Applications) (e.g. Punzón et al, 2010;Castro et al, 2010Castro et al, , 2011 have been used in recent studies. However, as cautioned by Castro et al (2010), the CLARA algorithm samples subsets of the overall data matrix.…”

“…Thus, there is a need to identify and segment fisheries and fleets into similar groupings, or métiers. A métier being "a homogeneous subdivision of a fishery by vessel type" incorporating a spatial and temporal component (ICES, 2003), also called 'fishing tactic' (Pelletier and Ferraris, 2000), 'fishing strategy' (Holley and Marchal, 2004), or 'fleet component' (Silva et al, 2002;2009;Castro et al, 2010Castro et al, , 2011. These multivariate methods have also been recommended by the ICES Study Group on the Development of Fishery based Forecasts (SGDFF; ICES, 2003).…”