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Deep Demersal Fish Assemblage Structure in the Porcupine Seabight (Eastern North Atlantic): Slope Sampling By Three Different Trawls Compared

Published online by Cambridge University Press:  11 May 2009

N. R. Merrett ,
J. D. M. Gordon ,
M. Stehmann  and
R. L. Haedrich
N. R. Merrett
Affiliation:
Institute of Oceanographic Sciences Deacon Laboratory, Wormley, Godalming, Surrey GU UB Department of Zoology, The Natural History Museum, Cromwell Road, London SW BD
J. D. M. Gordon
Affiliation:
Dunstaffnage Marine Laboratory, Po Box 3, Oban, Argyll PA AD
M. Stehmann
Affiliation:
Ichthyologie, Institut für Seefischerei, 1c/o Zoological Museum, Martin-Luther-King-Platz 3, D-2000 Hamburg 13, Germany
R. L. Haedrich
Affiliation:
Ocean Sciences Center, MemorialUniversity of Newfoundland, St. John's, Newfoundland A1B X9, Canada
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Extract

The demersal ichthyofauna of the continental slope of the Porcupine Seabight, eastern North Atlantic, was studied from 144 samples taken by three different types of otter trawl. At least 118 species from 43 families were represented among some 54,000 specimens collected from 247 to 2172m soundings. Collectively, the catches were dominated in species richness by the Macrouridae, Alepocephalidae and Squalidae and in abundance by the Synaphobranchidae, Macrouridae and Moridae. Separately, relative abundance of species was more similar between the two larger trawls, setting their catches apart from the smaller net. Gear selectivity evidently accounted for this variation, which was examined by an index we developed and call species fidelity. This accounts for patterns of continuous faunal change with increased soundings concomitant with variance in species adult size and mobility. In pursuance of a more accurate representation of relative biomass and abun-dance than achieved hitherto, the best estimate, within the limitations imposed by the sampling gears and regime, was derived from a combination of the mean values per 200m stratum of the two large trawls with the addition of those of the eel, Synaphobranchus kaupi, from the small gear. Tentative comparisons between these results and those from elsewhere suggest that the Porcupine Seabight is generally lower in biomass and similar or lower in abundance. It was concluded that an accurate indication of ichthyofaunal structure with increased soundings can only be achieved through a detailed knowledge of the size structure of each species over its entire sounding range synthesized from a multi-trawl investigation via analyses of species fidelity.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 71 , Issue 2 , May 1991 , pp. 329 - 358
Copyright
Copyright © Marine Biological Association of the United Kingdom 1991

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