Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations
From 1971 to 1978 I conducted an exploitation experiment on lake whitefish (Coregonus clupeaformis) in four Northwest Territories lakes. The objective was to test the hypotheses that, when exploited, growth and recruitment would increase in the populations, and that the degree of increase would be p...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1980
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Online Access: | http://dx.doi.org/10.1139/f80-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/f80-033 |
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crcansciencepubl:10.1139/f80-033 2024-06-23T07:55:42+00:00 Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations Healey, M. C. 1980 http://dx.doi.org/10.1139/f80-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/f80-033 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 37, issue 2, page 255-267 ISSN 0706-652X 1205-7533 journal-article 1980 crcansciencepubl https://doi.org/10.1139/f80-033 2024-06-13T04:10:47Z From 1971 to 1978 I conducted an exploitation experiment on lake whitefish (Coregonus clupeaformis) in four Northwest Territories lakes. The objective was to test the hypotheses that, when exploited, growth and recruitment would increase in the populations, and that the degree of increase would be proportional to the intensity of exploitation. Significant increases in size-at-age were recorded in the exploited lakes, and the degree and persistence of the increase were proportional to the intensity of exploitation. Good recruitment was stimulated in the heavily exploited lake, and to a lesser degree in the moderately exploited lake. The hypotheses were, therefore, corroborated. Analyses of growth and year-class strength in the unexploited control lake and the lightly exploited lake indicated that natural variation in growth and recruitment, on a similar scale to that stimulated by exploitation, had occurred in the past. The compensatory responses of lake whitefish populations to exploitation appear to be a logical consequence of the natural population regulating mechanisms for the species. The results of my experiment indicate that in unexploited lakes, recruitment and growth of young fish is regulated by the established population of mature fish.Key words: lake whitefish, growth, recruitment, exploitation, population regulation Article in Journal/Newspaper Northwest Territories Canadian Science Publishing Northwest Territories Canadian Journal of Fisheries and Aquatic Sciences 37 2 255 267 |
institution |
Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
From 1971 to 1978 I conducted an exploitation experiment on lake whitefish (Coregonus clupeaformis) in four Northwest Territories lakes. The objective was to test the hypotheses that, when exploited, growth and recruitment would increase in the populations, and that the degree of increase would be proportional to the intensity of exploitation. Significant increases in size-at-age were recorded in the exploited lakes, and the degree and persistence of the increase were proportional to the intensity of exploitation. Good recruitment was stimulated in the heavily exploited lake, and to a lesser degree in the moderately exploited lake. The hypotheses were, therefore, corroborated. Analyses of growth and year-class strength in the unexploited control lake and the lightly exploited lake indicated that natural variation in growth and recruitment, on a similar scale to that stimulated by exploitation, had occurred in the past. The compensatory responses of lake whitefish populations to exploitation appear to be a logical consequence of the natural population regulating mechanisms for the species. The results of my experiment indicate that in unexploited lakes, recruitment and growth of young fish is regulated by the established population of mature fish.Key words: lake whitefish, growth, recruitment, exploitation, population regulation |
format |
Article in Journal/Newspaper |
author |
Healey, M. C. |
spellingShingle |
Healey, M. C. Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
author_facet |
Healey, M. C. |
author_sort |
Healey, M. C. |
title |
Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
title_short |
Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
title_full |
Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
title_fullStr |
Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
title_full_unstemmed |
Growth and Recruitment in Experimentally Exploited Lake Whitefish ( Coregonus clupeaformis) Populations |
title_sort |
growth and recruitment in experimentally exploited lake whitefish ( coregonus clupeaformis) populations |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/f80-033 http://www.nrcresearchpress.com/doi/pdf/10.1139/f80-033 |
geographic |
Northwest Territories |
geographic_facet |
Northwest Territories |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 37, issue 2, page 255-267 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f80-033 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
37 |
container_issue |
2 |
container_start_page |
255 |
op_container_end_page |
267 |
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1802648383264915456 |