Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys
The trawl data from the International 0-group fish surveys in the Barents Sea are analysed. The fishing powers of the participating vessels are estimated and corrected for. Relative indices of yearclass strength are computed on a linear and a logarithmic scale. The strongest yearclasses are found to...
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ftimr:oai:imr.brage.unit.no:11250/101089 2024-09-15T17:57:56+00:00 Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys Randa, Kjell 1982 application/pdf http://hdl.handle.net/11250/101089 eng eng ICES ICES CM documents;1982/G:43 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/101089 22 s. 0-gruppe 0-group VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Working paper 1982 ftimr 2024-07-31T03:37:25Z The trawl data from the International 0-group fish surveys in the Barents Sea are analysed. The fishing powers of the participating vessels are estimated and corrected for. Relative indices of yearclass strength are computed on a linear and a logarithmic scale. The strongest yearclasses are found to be, in order, 1970, 1975 and 1973. Medium year classes are 1971, 1977, 1972 and 1974, the rest, for the period 1965-1979, is poor. These indices, when excluding the 1969 yearclass, give a correlation of 0.93 for the linear index and 0.96 for the logarithmic index for the period 1965-1975, with VPA estimates of 3-years old cod. Linear regression are used to predict the absolute size of the recruitment 1976-1979 yearclasses, and indicates an average recruitment of about 300 mill. 3-years old fish . Report Barents Sea Institute for Marine Research: Brage IMR |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
0-gruppe 0-group VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
spellingShingle |
0-gruppe 0-group VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Randa, Kjell Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
topic_facet |
0-gruppe 0-group VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
description |
The trawl data from the International 0-group fish surveys in the Barents Sea are analysed. The fishing powers of the participating vessels are estimated and corrected for. Relative indices of yearclass strength are computed on a linear and a logarithmic scale. The strongest yearclasses are found to be, in order, 1970, 1975 and 1973. Medium year classes are 1971, 1977, 1972 and 1974, the rest, for the period 1965-1979, is poor. These indices, when excluding the 1969 yearclass, give a correlation of 0.93 for the linear index and 0.96 for the logarithmic index for the period 1965-1975, with VPA estimates of 3-years old cod. Linear regression are used to predict the absolute size of the recruitment 1976-1979 yearclasses, and indicates an average recruitment of about 300 mill. 3-years old fish . |
format |
Report |
author |
Randa, Kjell |
author_facet |
Randa, Kjell |
author_sort |
Randa, Kjell |
title |
Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
title_short |
Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
title_full |
Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
title_fullStr |
Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
title_full_unstemmed |
Recruitment indeces of the Arcto-Norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
title_sort |
recruitment indeces of the arcto-norwegian cod for the period 1965-1979 based on the international 0-group fish surveys |
publisher |
ICES |
publishDate |
1982 |
url |
http://hdl.handle.net/11250/101089 |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
22 s. |
op_relation |
ICES CM documents;1982/G:43 This report is not to be quoted without prior consultation with the General Secretary. http://hdl.handle.net/11250/101089 |
_version_ |
1810434148070850560 |