Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr
Sea‐run post‐smolt Arctic charr Salvelinus alpinus , (15–26 cm) from Storvatn, northern Norway (70°39′48″N) had significantly higher average specific growth rates in two years (1·64 and 1·66) than the corresponding lake‐dwelling charr (0·53 and 1·20). The post‐smolts displayed fast compensatory grow...
Published in: | Journal of Fish Biology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2000
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1095-8649.2000.tb00479.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2000.tb00479.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2000.tb00479.x |
id |
crwiley:10.1111/j.1095-8649.2000.tb00479.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1095-8649.2000.tb00479.x 2024-06-02T08:00:05+00:00 Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr Rikardsen, A. H. Amundsen, P.‐A. Bjørn, P. A. Johansen, M. 2000 http://dx.doi.org/10.1111/j.1095-8649.2000.tb00479.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2000.tb00479.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2000.tb00479.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 57, issue 5, page 1172-1188 ISSN 0022-1112 1095-8649 journal-article 2000 crwiley https://doi.org/10.1111/j.1095-8649.2000.tb00479.x 2024-05-03T11:43:25Z Sea‐run post‐smolt Arctic charr Salvelinus alpinus , (15–26 cm) from Storvatn, northern Norway (70°39′48″N) had significantly higher average specific growth rates in two years (1·64 and 1·66) than the corresponding lake‐dwelling charr (0·53 and 1·20). The post‐smolts displayed fast compensatory growth in the first 2–3 weeks of their sea residency, but then almost stopped growing prior to their return to fresh water. Lake‐dwelling charr grew more evenly during the same time period. Thus, the anadromous charr may return to the lake after only 5–6 weeks in the sea, because the potential to maintain a high growth rate in the sea is reduced. The marine diet consisted mainly of the two crustacean plankton species Calanus finmarchicus , and Thysanoëssa , sp. (88%), and less of fish (6%), insects (4%) and benthos (2%). The diet of lake‐dwelling charr consisted mainly of insects (58%, mostly chironomid pupae) and zoobenthos (29%), and less of zooplankton (13%) during the same time period. Although post‐smolts had the highest growth rates, they had significantly lower food consumption rates and higher frequencies of empty stomachs than the corresponding lake‐dwelling fish. Possible explanations for this paradox are discussed in relation to stomach evacuation rates, water temperature, feeding behaviour and the energy content of the food in the two environments. Article in Journal/Newspaper Arctic charr Arctic Calanus finmarchicus Northern Norway Salvelinus alpinus Zooplankton Wiley Online Library Arctic Norway Journal of Fish Biology 57 5 1172 1188 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Sea‐run post‐smolt Arctic charr Salvelinus alpinus , (15–26 cm) from Storvatn, northern Norway (70°39′48″N) had significantly higher average specific growth rates in two years (1·64 and 1·66) than the corresponding lake‐dwelling charr (0·53 and 1·20). The post‐smolts displayed fast compensatory growth in the first 2–3 weeks of their sea residency, but then almost stopped growing prior to their return to fresh water. Lake‐dwelling charr grew more evenly during the same time period. Thus, the anadromous charr may return to the lake after only 5–6 weeks in the sea, because the potential to maintain a high growth rate in the sea is reduced. The marine diet consisted mainly of the two crustacean plankton species Calanus finmarchicus , and Thysanoëssa , sp. (88%), and less of fish (6%), insects (4%) and benthos (2%). The diet of lake‐dwelling charr consisted mainly of insects (58%, mostly chironomid pupae) and zoobenthos (29%), and less of zooplankton (13%) during the same time period. Although post‐smolts had the highest growth rates, they had significantly lower food consumption rates and higher frequencies of empty stomachs than the corresponding lake‐dwelling fish. Possible explanations for this paradox are discussed in relation to stomach evacuation rates, water temperature, feeding behaviour and the energy content of the food in the two environments. |
format |
Article in Journal/Newspaper |
author |
Rikardsen, A. H. Amundsen, P.‐A. Bjørn, P. A. Johansen, M. |
spellingShingle |
Rikardsen, A. H. Amundsen, P.‐A. Bjørn, P. A. Johansen, M. Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
author_facet |
Rikardsen, A. H. Amundsen, P.‐A. Bjørn, P. A. Johansen, M. |
author_sort |
Rikardsen, A. H. |
title |
Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
title_short |
Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
title_full |
Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
title_fullStr |
Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
title_full_unstemmed |
Comparison of growth, diet and food consumption of sea‐run and lake‐dwelling Arctic charr |
title_sort |
comparison of growth, diet and food consumption of sea‐run and lake‐dwelling arctic charr |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1111/j.1095-8649.2000.tb00479.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2000.tb00479.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2000.tb00479.x |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic charr Arctic Calanus finmarchicus Northern Norway Salvelinus alpinus Zooplankton |
genre_facet |
Arctic charr Arctic Calanus finmarchicus Northern Norway Salvelinus alpinus Zooplankton |
op_source |
Journal of Fish Biology volume 57, issue 5, page 1172-1188 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.2000.tb00479.x |
container_title |
Journal of Fish Biology |
container_volume |
57 |
container_issue |
5 |
container_start_page |
1172 |
op_container_end_page |
1188 |
_version_ |
1800744099645489152 |