dc.contributor.author | Eliassen, Jens-Eric | |
dc.date.accessioned | 2008-01-09T08:48:27Z | |
dc.date.issued | 1986 | |
dc.identifier.issn | 0071-5638 | |
dc.identifier.uri | http://hdl.handle.net/11250/112831 | |
dc.description.abstract | Roundnose grenadier (Coryphaenoides rupestris Gunnerus) were found in
reasonable concentrations in four areas in Trøndelag, Norway. Inside the
Trondheimsfjord, within a 400 to 500 m deep basin, about 340 kg was taken
per half-hour-tow using a bottom prawn trawl. Around 500 kg per half-hour
was taken in a 400-530 m deep basin in the Flatanger-Folla area, while catches
above 3060 kg per half-hour were taken in a 350 m deep basin in the inner
part of Foldenfjorden. Only few specimens were taken by use of pelagic
trawl. In the deeper basins outside the near coastal areas, the catch rates
were found too small for commercial fishing. The age of maturity was found to
be about 8 and 10 years for males and females, respectively. Natural mortality
rate was estimated to 0.1. The biomass in the four major areas was calculated
to about 15 000 tonnes using echo-integrations combined with pelagic and
bottom trawl sampling, and a sustainable yield of 2000 per year was suggested.
The roundnose grenadier was only found in waters with temperatures above
7.0°C. The roundnose grenadier and the greater silver smelt (argentine),
Argentina silus, were the two dominant fishes caught; the former accounted
for 70% to 95% and the latter for 3% to 25% of the total catch. | en |
dc.format.extent | 850063 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | nob | en |
dc.publisher | Havforskningsinstituttet | en |
dc.relation.ispartofseries | Fisken og havet | en |
dc.relation.ispartofseries | 1986-01 | en |
dc.subject | skolest | en |
dc.subject | roundnose grenadier | en |
dc.subject | stock assessment | |
dc.subject | bestandsberegning | |
dc.title | Undersøkelser av utbredelser, forekomster og bestandsstruktur av skolest (Coryphaenoides rupestris Gunnerus) i Trøndelag | en |
dc.title.alternative | Investigations on the distribution, occurrence and population structure of the roundnose grenadier (Coryphaenoides rupestris Gunnerus) in the coastal waters off Trøndelag, Norway | en |
dc.type | Research report | en |
dc.source.pagenumber | 19s. | en |
dc.source.issue | 1986-01 | en |