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Catchability of pelagic trawls for sampling deep-living nekton in the mid-North Atlantic

Heino, Mikko; Porteiro, Filipe M.; Sutton, Tracey T.; Falkenhaug, Tone; Godø, Olav Rune; Piatkowski, Uwe
Journal article, Peer reviewed
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ICES_JoMarSci_2011_68_2_377-389.pdf (337.2Kb)
URI
http://hdl.handle.net/11250/117021
Date
2010-06-29
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  • The Aquaculture Programme [21]
Original version
http://dx.doi.org/10.1093/icesjms/fsq089
Abstract
Material collected in summer 2004 from the Mid-Atlantic Ridge between Iceland and the Azores with three pelagic trawls was used to

estimate relative catchabilities of common fish, cephalopod, decapod, and jellyfish species. Catchability is defined as the ratio of

numbers caught between two trawls, standardized for towed distance. Taxon-specific catchability coefficients were estimated for

two large pelagic trawls with graded meshes, using a smaller pelagic trawl with a uniform mesh size as the reference trawl. Two of

the trawls were equipped with multiple opening–closing codends that allowed sampling of different depth layers. Generalized

linear and mixed models suggest that most of the taxa have catchabilities much lower than expected from the area of opening

alone, indicating that only a few species are herded by the large mesh at the mouth of larger trawls. Catchability coefficients

across taxa show a very large spread, indicating that the sampled volume for the larger trawls with graded meshes was highly

taxon-specific. Part of this variability can be explained by body size and taxonomic group, the latter probably reflecting differences

in body form and behaviour. The catchability estimates presented here form the basis for combining data for quantitative analyses

of community structure.
Publisher
Oxford University Press
Journal
ICES Journal of Marine Science

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