The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys
The proceedings of the Soviet-Norwegian symposium on: Reproduction and recruitment of Arctic cod. Leningrad 26 - 30 September 1983. Spawning intensity measurements have been executed in Lofoten each year since 1976. They consist of egg net samples at selected spawning cites . In 1983, in addition, f...
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ftimr:oai:imr.brage.unit.no:11250/107621 2023-05-15T14:30:29+02:00 The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys Sundby, Svein Solemdal, Per 1984 955645 bytes application/pdf http://hdl.handle.net/11250/107621 eng eng PINRO-IMR Symposium 1 http://hdl.handle.net/11250/107621 s. 113-135 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Conference object 1984 ftimr 2021-09-23T20:15:04Z The proceedings of the Soviet-Norwegian symposium on: Reproduction and recruitment of Arctic cod. Leningrad 26 - 30 September 1983. Spawning intensity measurements have been executed in Lofoten each year since 1976. They consist of egg net samples at selected spawning cites . In 1983, in addition, four quasi-synoptic egg surveys were conducted during the spawning ceason coverinq the total spawning area in Lofoten. These data are used to estimate the egg production during the spawning season 1983. The estimates are done by two methods. In the first method stage 1, 2 and 3 cod eggs a r e used i n eaeh survey t o qet 3x4=12 estimates of the egg production per day at different t imes during the spawning season. The 1 2 values are used to construct an egg production curve for the spawning season. The curve is integrated to get an estimate of the total egg productian. By the other method certain assumptions about the egg distribution field have to be done, and the total egg production is computed by combining the spawning intensity data with one quasi-synoptic survey. The first method is the most correc tone. The second method is more rapid and needs less ships time and time for egg analysis. It is discussed how to get the second method more accurate. Conference Object Arctic cod Arctic Gadus morhua Lofoten Institute for Marine Research: Brage IMR Arctic Lofoten |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
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VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 Sundby, Svein Solemdal, Per The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
topic_facet |
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 |
description |
The proceedings of the Soviet-Norwegian symposium on: Reproduction and recruitment of Arctic cod. Leningrad 26 - 30 September 1983. Spawning intensity measurements have been executed in Lofoten each year since 1976. They consist of egg net samples at selected spawning cites . In 1983, in addition, four quasi-synoptic egg surveys were conducted during the spawning ceason coverinq the total spawning area in Lofoten. These data are used to estimate the egg production during the spawning season 1983. The estimates are done by two methods. In the first method stage 1, 2 and 3 cod eggs a r e used i n eaeh survey t o qet 3x4=12 estimates of the egg production per day at different t imes during the spawning season. The 1 2 values are used to construct an egg production curve for the spawning season. The curve is integrated to get an estimate of the total egg productian. By the other method certain assumptions about the egg distribution field have to be done, and the total egg production is computed by combining the spawning intensity data with one quasi-synoptic survey. The first method is the most correc tone. The second method is more rapid and needs less ships time and time for egg analysis. It is discussed how to get the second method more accurate. |
format |
Conference Object |
author |
Sundby, Svein Solemdal, Per |
author_facet |
Sundby, Svein Solemdal, Per |
author_sort |
Sundby, Svein |
title |
The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
title_short |
The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
title_full |
The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
title_fullStr |
The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
title_full_unstemmed |
The egg production of Arcto-Norwegian cod (Gadus morhua L.) in the Lofoten area estimated by egg surveys |
title_sort |
egg production of arcto-norwegian cod (gadus morhua l.) in the lofoten area estimated by egg surveys |
publishDate |
1984 |
url |
http://hdl.handle.net/11250/107621 |
geographic |
Arctic Lofoten |
geographic_facet |
Arctic Lofoten |
genre |
Arctic cod Arctic Gadus morhua Lofoten |
genre_facet |
Arctic cod Arctic Gadus morhua Lofoten |
op_source |
s. 113-135 |
op_relation |
PINRO-IMR Symposium 1 http://hdl.handle.net/11250/107621 |
_version_ |
1766304331948097536 |