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Body condition of predatory fishes linked to the availability of sandeels

Citation

Engelhard, GH and Blanchard, JL and Pinnegar, JK and van der Kooij, J and Bell, ED and Mackinson, S and Righton, DA, Body condition of predatory fishes linked to the availability of sandeels, Marine Biology, 160, (2) pp. 299-308. ISSN 0025-3162 (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Crown Copyright

DOI: doi:10.1007/s00227-012-2088-1

Abstract

Lesser sandeels Ammodytes marinus are eaten by a range of predatory fishes including commercially fished species, but are also exploited at large scale by industrial fisheries. Is availability of sandeels, as key prey source, linked to the body condition of predatory fishes? In the North Sea, the largest sandeel biomass is concentrated in the Dogger Bank region. Here we studied predator–sandeel interactions at two sites differing widely in sandeel abundance and local sandeel fishing effort. Surveys took place in 2004, 2005, and 2006, years when local sandeel densities observed at these sites were low, intermediate, and high, respectively. Five predator species––whiting, lesser weever, grey gurnard, plaice, and haddock––showed better body condition indices in either the years or study area (or both) characterised by higher local sandeel densities, when compared to sandeel-poorer conditions. Moreover, whiting, weever, and gurnard condition was better for those individuals actually observed to have eaten sandeels (based on stomach contents) than for those that had not. As body condition relates to growth, reproduction, and survival, predators in sandeel-rich conditions may be inferred to have a higher fitness. These links between sandeel availability, sandeel consumption, and predator condition hint that, if large-scale localised depletions of sandeels were to occur, negative indirect effects on predatory fish might become apparent, underlining the importance of considering the sandeel fishery in an ecosystem context.

Item Details

Item Type:Refereed Article
Keywords:condition indices, sandeels, North Sea
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Community Ecology
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:Blanchard, JL (Dr Julia Blanchard)
ID Code:100481
Year Published:2013
Web of Science® Times Cited:7
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2015-05-18
Last Modified:2015-08-25
Downloads:0

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