Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway
The population structure of capelin over a one-year period in Balsfjord (69°N 19°E), northern Norway, is described. At about one year old, young capelin changed over from a relatively pelagic orientation to one more closely associated with the bottom during the day. The semi-adult and adult part of...
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Oxford University Press
1988
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fthighwire:oai:open-archive.highwire.org:icesjms:44/3/264 2023-05-15T15:37:25+02:00 Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway Nyholmen, O. Hopkins, C. C. E. 1988-01-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/44/3/264 https://doi.org/10.1093/icesjms/44.3.264 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/44/3/264 http://dx.doi.org/10.1093/icesjms/44.3.264 Copyright (C) 1988, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 1988 fthighwire https://doi.org/10.1093/icesjms/44.3.264 2013-05-27T23:10:08Z The population structure of capelin over a one-year period in Balsfjord (69°N 19°E), northern Norway, is described. At about one year old, young capelin changed over from a relatively pelagic orientation to one more closely associated with the bottom during the day. The semi-adult and adult part of the stock usually resided in the deep basin of the fjord during the autumn and winter (September to March) before migrating towards the head of the fjord (ca. 25 km away) in April. Beach spawning, at temperatures close to 0°C, occurred mainly in May. Although two-year-olds dominated (ca. 75%) the spawning stock in both sexes, there is a distinct likelihood of second-time spawning in females. The regression coefficient (β) for “wet” body weight on length varied greatly with season (min.–max.: males 1.980–3.867, females 2.667–3.136), significant differences were apparent between the sexes, and (β) deviated from 3 (isometric growth) in nearly all months. Possible reasons for changes in β-values are discussed. As the spawning migration is short the energetic costs of swimming cannot account for the pronounced catabolic changes noted at this time. Maturity and spawning parameters, as well as evidence from parasitological tags, indicate that Balsfjord capelin are an isolated fjordic population, segregated from the Barents Sea stock. Text Balsfjord Barents Sea Northern Norway HighWire Press (Stanford University) Barents Sea Norway Balsfjord ENVELOPE(19.227,19.227,69.240,69.240) ICES Journal of Marine Science 44 3 264 276 |
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HighWire Press (Stanford University) |
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English |
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Articles |
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Articles Nyholmen, O. Hopkins, C. C. E. Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
topic_facet |
Articles |
description |
The population structure of capelin over a one-year period in Balsfjord (69°N 19°E), northern Norway, is described. At about one year old, young capelin changed over from a relatively pelagic orientation to one more closely associated with the bottom during the day. The semi-adult and adult part of the stock usually resided in the deep basin of the fjord during the autumn and winter (September to March) before migrating towards the head of the fjord (ca. 25 km away) in April. Beach spawning, at temperatures close to 0°C, occurred mainly in May. Although two-year-olds dominated (ca. 75%) the spawning stock in both sexes, there is a distinct likelihood of second-time spawning in females. The regression coefficient (β) for “wet” body weight on length varied greatly with season (min.–max.: males 1.980–3.867, females 2.667–3.136), significant differences were apparent between the sexes, and (β) deviated from 3 (isometric growth) in nearly all months. Possible reasons for changes in β-values are discussed. As the spawning migration is short the energetic costs of swimming cannot account for the pronounced catabolic changes noted at this time. Maturity and spawning parameters, as well as evidence from parasitological tags, indicate that Balsfjord capelin are an isolated fjordic population, segregated from the Barents Sea stock. |
format |
Text |
author |
Nyholmen, O. Hopkins, C. C. E. |
author_facet |
Nyholmen, O. Hopkins, C. C. E. |
author_sort |
Nyholmen, O. |
title |
Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
title_short |
Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
title_full |
Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
title_fullStr |
Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
title_full_unstemmed |
Some observations on the population biology of capelin (Mallotus villosus) from Balsfjord, northern Norway |
title_sort |
some observations on the population biology of capelin (mallotus villosus) from balsfjord, northern norway |
publisher |
Oxford University Press |
publishDate |
1988 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/44/3/264 https://doi.org/10.1093/icesjms/44.3.264 |
long_lat |
ENVELOPE(19.227,19.227,69.240,69.240) |
geographic |
Barents Sea Norway Balsfjord |
geographic_facet |
Barents Sea Norway Balsfjord |
genre |
Balsfjord Barents Sea Northern Norway |
genre_facet |
Balsfjord Barents Sea Northern Norway |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/44/3/264 http://dx.doi.org/10.1093/icesjms/44.3.264 |
op_rights |
Copyright (C) 1988, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1093/icesjms/44.3.264 |
container_title |
ICES Journal of Marine Science |
container_volume |
44 |
container_issue |
3 |
container_start_page |
264 |
op_container_end_page |
276 |
_version_ |
1766367980038389760 |