An investigation of human vs. technology-induced variation in catchability for a selection of European fishing fleets
|Author(s)||Mahevas Stephanie1, Vermard Youen2, Hutton Trevor3, Iriondo Ane4, Jadaud Angelique5, Maravelias Christos D.6, Punzon Antonio7, Sacchi Jacques5, Tidd Alex8, Tsitsika Efthymia6, Marchal Paul2, Goascoz Nicolas5, Mortreux Serge5, Roos David5|
|Affiliation(s)||1 : IFREMER, Dept Ecol & Models Fishery Sci, F-44311 Nantes, France.
2 : IFREMER, Channel & N Sea Fisheries Dept, F-62321 Boulogne Sur Mer, France.
3 : CSIRO, Brisbane, Qld 4102, Australia.
4 : AZTI Tecnalia, Sukarrieta 48395, Spain.
5 : IFREMER, EME, UMR 212, F-34203 Sete, France.
6 : Hellen Ctr Marine Res, Anavyssos 19013, Attica, Greece.
7 : CO Santander, Inst Espanol Ocean, Santander 39080, Spain.
8 : Cefas, Lowestoft NR33 0HT, Suffolk, England.
|Source||Ices Journal Of Marine Science (1054-3139) (Oxford Univ Press), 2011-11 , Vol. 68 , N. 10 , P. 2252-2263|
|WOS© Times Cited||14|
|Keyword(s)||catchability, fishing power, GAM, GLM, skipper skill, technical characteristics|
|Abstract||The impact of the fishing effort exerted by a vessel on a population depends on catchability, which depends on population accessibility and fishing power. The work investigated whether the variation in fishing power could be the result of the technical characteristics of a vessel and/or its gear or whether it is a reflection of inter-vessel differences not accounted for by the technical attributes. These inter-vessel differences could be indicative of a skipper/crew experience effect. To improve understanding of the relationships, landings per unit effort (lpue) from logbooks and technical information on vessels and gears (collected during interviews) were used to identify variables that explained variations in fishing power. The analysis was undertaken by applying a combination of generalized additive models and generalized linear models to data from several European fleets. The study highlights the fact that taking into account information that is not routinely collected, e. g. length of headline, weight of otter boards, or type of groundrope, will significantly improve the modelled relationships between lpue and the variables that measure relative fishing power. The magnitude of the skipper/crew experience effect was weaker than the technical effect of the vessel and/or its gear.|