Quantifying the impact of environmental variables upon catch-per-unit-effort of the Blue Shark Prionace glauca in the Western English Channel

Mitchell, JD; Collins, KJ; Miller, PI; Suberg, LA. 2014 Quantifying the impact of environmental variables upon catch-per-unit-effort of the Blue Shark Prionace glauca in the Western English Channel. Journal of Fish Biology. 10.1111/jfb.12448

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Abstract/Summary

The effect of environmental variables on blue shark Prionace glauca catch per unit effort (CPUE) in a recreational fishery in the western English Channel, between June and September 1998–2011, was quantified using generalized additive models (GAMs). Sea surface temperature (SST) explained 1·4% of GAM deviance, and highest CPUE occurred at 16·7° C, reflecting the optimal thermal preferences of this species. Surface chlorophyll a concentration (CHL) significantly affected CPUE and caused 27·5% of GAM deviance. Additionally, increasing CHL led to rising CPUE, probably due to higher productivity supporting greater prey biomass. The density of shelf-sea tidal mixing fronts explained 5% of GAM deviance, but was non-significant, with increasing front density negatively affecting CPUE. Time-lagged frontal density significantly affected CPUE, however, causing 12·6% of the deviance in a second GAM and displayed a positive correlation. This outcome suggested a delay between the evolution of frontal features and the subsequent accumulation of productivity and attraction of higher trophic level predators, such as P. glauca.

Item Type: Publication - Article
Additional Keywords: environmental preferences, fisheries management, generalized additive model, recreational fishery, oceanic fronts
Subjects: Earth Observation - Remote Sensing
Fisheries
Management
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Sea from Space
Depositing User: Dr Peter I Miller
Date made live: 07 Jul 2014 10:23
Last Modified: 06 Jun 2017 16:12
URI: http://plymsea.ac.uk/id/eprint/6137

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