Spanish otter trawl fisheries in the Cantabrian Sea

Abstract

Punzón, A., Hernández, C., Abad, E., Castro, J., Pérez, N., and Trujillo, V. 2010. Spanish otter trawl fisheries in the Cantabrian Sea. – ICES Journal of Marine Science 67: 1604–1616 A non-hierarchical classification technique (clustering large applications, CLARA) was used to identify four fishing tactics of Spanish otter trawlers in the Cantabrian Sea (ICES Division VIIIc) from 1983 to 2004: mixed fishing, blue whiting fishing, horse mackerel fishing, and mackerel fishing. There were no significant differences in the fishing tactics employed by two trawl fleets identified using a non-hierarchical classification technique (partition around medoids). There was, however, a decline in the use of the blue whiting fishing tactic from 2000 on, perhaps as a result of competition with pairtrawls, a gear whose main target species is blue whiting. There was an increase in the number of trips using the mackerel fishing tactic from 1996, a change possibly caused by improved market conditions. Between 2000 and 2004, the fleets had two distinct behaviour patterns, identified depending on the area in which they operated. The study area could therefore be subdivided into two areas based on the prevalence of the fishing tactic followed. The horse mackerel fishing tactic was more commonly used in the west, and the mixed fishing tactic in the east.

Metazoan parasite communities and diet of the velvet belly lantern shark Etmopterus spinax (Squaliformes: Etmopteridae): a comparison of two deep‐sea ecosystems

“…The higher abundance of Anisakis sp. at the AC may also be associated with the higher fishery efforts at this locality (Rodríguez‐Cabello et al ., ; Punzón et al ., ) compared with the GB (Piñeiro et al ., ). Fishing pressure has been shown to have a negative effect on the diversity and abundance of parasites with complex life cycles (Wood & Lafferty, ).…”

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.…”

Sea pen (Pennatulacea) aggregations on the northern Spanish shelf: distribution and faunal assemblages

“…In contrast to the North Sea, the Irish Sea and northern Bay of Biscay, where Nephrops is one of the most important fisheries, in the southern Bay of Biscay N. norvegicus has stopped being a target species over time due to its low abundance. Nevertheless, it is a valued component of the mixed bottom trawl fishery together with hake, anglerfish, megrim, horse mackerel, mackerel and blue whiting (Fariña and Herraiz 2003, Punzón et al 2010, ICES 2012. The Nephrops stock is declining in the study area (Fariña and Herraiz 2003) and recovery plans were adopted in 2005 (Council Regulation (EC) 2166/2005.…”