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Title: Catch and Discards for a Deep-Water Trawl Survey in 1996
Authors: Kelly, C J
Clarke, M
Connolly, P L
Keywords: Leaflet
Issue Date: 1997
Publisher: Marine Institute
Citation: Kelly, C. J., Clarke, M. & Connolly, P. L., "Catch and Discards for a Deep-Water Trawl Survey in 1996", Fishery Leaflet, Marine Institute 1997
Series/Report no.: Fishery Leaflet;175
Abstract: The Fisheries Research Centre has conducted a deep-water survey programme since 1993 and as part of this programme a deep-water trawl survey was carried out in September 1996. The survey fished areas along the continental slope west of Ireland from 52° N to 58° N at depths of 500-1,200m The primary objective was to secure samples of potentially commercial deep-water shark and teleost species in order to examine aspects of their age, growth, reproduction and diet. The survey was conducted on a chartered commercial fishing vessel using a deep-water otter trawl fitted with a small mesh cod-end liner. A total of 26 hauls were made during 87 hours of fishing and yielded a total catch of 29,345 kg. The ground covered ranged from mud to gravel and bare rock and there was no significant gear damage during the survey. Thirteen species of chondrichtian and 33 species of teleost fish were recorded. Length, weight sex and maturity data were taken from some of these species. The most abundant species in the catch were Baird's smoothhead, roundnose grenadier, leafscale gulper shark, black scabbard and orange roughy. Trawl discards expressed as kg discarded per tonne of roundnose grenadier landed were calculated for a broad range of the most abundant species in the catch. During the survey in the Rockall Trough an estimated 16t of deep-water species were discarded and results are compared to estimates for 1995. The main species discarded were smoothhead, squaliform sharks and Lepidion eques. Results indicate up to 16,783t of deep-water species may have been discarded from the deep-water fishery in this area in 1996. This report documents the survey and presents some preliminary results. The data gathered during these surveys are currently under analysis at the PRC and the results will be published in the scientific literature.
ISSN: 0332-1789
Appears in Collections:Irish Fisheries Leaflets

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