Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland
The population structure and seasonal changes in condition factors of the burbot in a shallow coastal region of the north‐eastern Bothnian Bay are described. The significance of the so‐called rest years is examined by comparing condition indices in immature or sterile and mature burbot. The somatic...
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Language: | English |
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1990
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crwiley:10.1111/j.1095-8649.1990.tb05600.x 2024-06-02T08:04:38+00:00 Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland Pulliainen, E. Korhonen, K. 1990 http://dx.doi.org/10.1111/j.1095-8649.1990.tb05600.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1990.tb05600.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1990.tb05600.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 36, issue 2, page 251-259 ISSN 0022-1112 1095-8649 journal-article 1990 crwiley https://doi.org/10.1111/j.1095-8649.1990.tb05600.x 2024-05-03T11:10:29Z The population structure and seasonal changes in condition factors of the burbot in a shallow coastal region of the north‐eastern Bothnian Bay are described. The significance of the so‐called rest years is examined by comparing condition indices in immature or sterile and mature burbot. The somatic condition index ( K 2 ), liver index ( K 1 ), intestine index ( K 1 ) and gonad index ( K g ) are determined monthly in terms of organ weight in relation to body length. Approximately 30% of the whole catch of 1052 burbot were non‐maturing but were 40 cm or more in length. K 2 , K 1 and K 1 were lowest in the autumn, when the first sign of gonad recrudescence was observed in mature burbot. The non‐maturing burbot were never in poorer condition than mature ones. As mature and non‐maturing burbot dissipated their energy stores during the warmest period of the summer, it is concluded that burbot spending a rest year do not accumulate and store energy reserves over the summer for the next year, and that such rest years, if they exist, do not occur for nutritional reasons. Article in Journal/Newspaper Burbot Lota lota Northern Finland lota Wiley Online Library Journal of Fish Biology 36 2 251 259 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
The population structure and seasonal changes in condition factors of the burbot in a shallow coastal region of the north‐eastern Bothnian Bay are described. The significance of the so‐called rest years is examined by comparing condition indices in immature or sterile and mature burbot. The somatic condition index ( K 2 ), liver index ( K 1 ), intestine index ( K 1 ) and gonad index ( K g ) are determined monthly in terms of organ weight in relation to body length. Approximately 30% of the whole catch of 1052 burbot were non‐maturing but were 40 cm or more in length. K 2 , K 1 and K 1 were lowest in the autumn, when the first sign of gonad recrudescence was observed in mature burbot. The non‐maturing burbot were never in poorer condition than mature ones. As mature and non‐maturing burbot dissipated their energy stores during the warmest period of the summer, it is concluded that burbot spending a rest year do not accumulate and store energy reserves over the summer for the next year, and that such rest years, if they exist, do not occur for nutritional reasons. |
format |
Article in Journal/Newspaper |
author |
Pulliainen, E. Korhonen, K. |
spellingShingle |
Pulliainen, E. Korhonen, K. Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
author_facet |
Pulliainen, E. Korhonen, K. |
author_sort |
Pulliainen, E. |
title |
Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
title_short |
Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
title_full |
Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
title_fullStr |
Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
title_full_unstemmed |
Seasonal changes in condition indices in adult mature and non‐maturing burbot, Lota lota (L.), in the north‐eastern Bothnian Bay, northern Finland |
title_sort |
seasonal changes in condition indices in adult mature and non‐maturing burbot, lota lota (l.), in the north‐eastern bothnian bay, northern finland |
publisher |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1990.tb05600.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1990.tb05600.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1990.tb05600.x |
genre |
Burbot Lota lota Northern Finland lota |
genre_facet |
Burbot Lota lota Northern Finland lota |
op_source |
Journal of Fish Biology volume 36, issue 2, page 251-259 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1990.tb05600.x |
container_title |
Journal of Fish Biology |
container_volume |
36 |
container_issue |
2 |
container_start_page |
251 |
op_container_end_page |
259 |
_version_ |
1800749284112465920 |