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• W1978699763 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 369:213-227 (2008) - DOI: https://doi.org/10.3354/meps07575 Fishing mortality versus natural predation on diurnally migrating sandeels Ammodytes marinus Georg H. Engelhard*, Jeroen van der Kooij, Ewen D. Bell, John K. Pinnegar, Julia L. Blanchard, Steven Mackinson, David A. Righton Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road, Lowestoft NR33 0HT, UK *Email: georg.engelhard@cefas.co.uk ABSTRACT: Do large-scale industrial fisheries for sandeels impact ‘human consumption’ fishes by depriving them of food? In the North Sea, most sandeel fishing takes place on the Dogger Bank during spring. Here, we studied sandeel–fishery and sandeel–predatory fish interactions in 2 sampling grids, focussing on (1) how localised sandeels are distributed during the day (when feeding pelagically) and at night (when buried in the seabed); (2) how precisely the fishery can target localised sandeel concentrations; and (3) how tightly day/night sandeel distributions are linked to the local abundance of predatory fishes and their sandeel consumption. Sandeel abundance differed widely between both grids. Within each grid, marked day/night differences in distributions indicated extensive diurnal migrations, with centres of gravity of day and night distributions up to 15 km apart. Fishing effort was tightly matched with sandeel populations during the day and was far higher in the ‘high sandeel density’ grid. Only at the finest scale examined, effort was concentrated at sandbanks but not significantly matched with local sandeel numbers. This suggested either insufficient knowledge among fishers or vessel maneuverability issues, possibly relating to high mobility of sandeels. Ten predatory fishes (8 ‘human consumption’ species) preyed on sandeels, most notably whiting and lesser weever. Spatial comparisons showed that the predominant sandeel predators were whiting during the day and lesser weever at night. Tight predator–prey interdependencies were revealed: whiting and weever exhibited ‘aggregative responses’ to sandeels, and most predators consumed more sandeels in the ‘high sandeel density’ grid. On the Dogger Bank, sandeel fishing effort is concentrated when and where sandeels are most available, but also where these are extensively and locally preyed upon by at least 10 predatory fish species. Hence concerns that this industrial fishery may indirectly impact predatory fishes by depriving them of food might have some basis. KEY WORDS: Ecosystem impacts · Sandeels · Industrial fishery · Predator–prey links · Diurnal movements · Fishing effort · Whiting · Lesser weever Full text in pdf format PreviousNextCite this article as: Engelhard GH, van der Kooij J, Bell ED, Pinnegar JK, Blanchard JL, Mackinson S, Righton DA (2008) Fishing mortality versus natural predation on diurnally migrating sandeels Ammodytes marinus. Mar Ecol Prog Ser 369:213-227. https://doi.org/10.3354/meps07575 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 369. Online publication date: October 13, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research." @default.
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• W1978699763 title "Fishing mortality versus natural predation on diurnally migrating sandeels Ammodytes marinus" @default.
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