The Cephalopod by-Catch of Deep-Water Trawling on the Hebrides Slope

Deep-water trawling for fish species on the shelf slope off Scotland results in a by-catch of rare cephalopod species. The cirrate octopus Opisthoteuthis grimaldii is normally present below 800 m; at least one other species of cirrate and five species of incirrate octopus are found; significant exte...

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Bibliographic Details
Published in:Journal of the Marine Biological Association of the United Kingdom 1998-08, Vol.78 (3), p.1023-1026
Main Authors: Boyle, P.R., Collins, M.A., Williamson, G.R.
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Cirrata
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fundamental and applied biological sciences. Psychology
Marine
Ommastrephidae
Opisthoteuthis grimaldii
Short Communications
Todarodes sagittatus
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Summary:Deep-water trawling for fish species on the shelf slope off Scotland results in a by-catch of rare cephalopod species. The cirrate octopus Opisthoteuthis grimaldii is normally present below 800 m; at least one other species of cirrate and five species of incirrate octopus are found; significant extensions of range and depth are recorded. An incidental catch of the ommastrephid squid, Todarodes sagittatus, included a fully mature specimen and is indicative of its probable breeding locations. The results highlight the many taxonomic and systematic uncertainties surrounding the rarer cephalopod forms, and emphasize the utility of the fishing by-catch.
ISSN:0025-3154
1469-7769
DOI:10.1017/S0025315400044982