Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake
Ages were determined of 6,571 whitefish for which sizes were recorded. A length-weight relationship, the percentage of both sexes mature at each age, the sex ratio, the proportion of mature females that spawn annually and the relationship between size of fish and number of eggs were determined from...
Published in: | Journal of the Fisheries Research Board of Canada |
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Language: | English |
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Canadian Science Publishing
1953
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Online Access: | http://dx.doi.org/10.1139/f53-025 http://www.nrcresearchpress.com/doi/pdf/10.1139/f53-025 |
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crcansciencepubl:10.1139/f53-025 2024-06-23T07:53:07+00:00 Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake Kennedy, W. A. 1953 http://dx.doi.org/10.1139/f53-025 http://www.nrcresearchpress.com/doi/pdf/10.1139/f53-025 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Journal of the Fisheries Research Board of Canada volume 10, issue 7, page 413-441 ISSN 0015-296X journal-article 1953 crcansciencepubl https://doi.org/10.1139/f53-025 2024-06-13T04:10:51Z Ages were determined of 6,571 whitefish for which sizes were recorded. A length-weight relationship, the percentage of both sexes mature at each age, the sex ratio, the proportion of mature females that spawn annually and the relationship between size of fish and number of eggs were determined from smaller samples.Growth rate is difficult to assess because of net selection, but it seems to be slower than in more southerly lakes. Growth appears to be limited to the period June to September inclusive.The total annual mortality rate of 61 per cent represents the unexploited condition—four years of commercial fishing with 51/2-inch mesh gill-nets produced no obvious change. A moderate mortality rate acting at all ages will easily account for thousands of eggs being produced for every whitefish that survives to maturity—it is unnecessary to assume a low percentage of eggs fertilized or excessive mortality among fertilized eggs or among young fish.A more intensive fishery would probably increase sustained yield. Article in Journal/Newspaper Great Slave Lake Canadian Science Publishing Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Journal of the Fisheries Research Board of Canada 10 7 413 441 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Ages were determined of 6,571 whitefish for which sizes were recorded. A length-weight relationship, the percentage of both sexes mature at each age, the sex ratio, the proportion of mature females that spawn annually and the relationship between size of fish and number of eggs were determined from smaller samples.Growth rate is difficult to assess because of net selection, but it seems to be slower than in more southerly lakes. Growth appears to be limited to the period June to September inclusive.The total annual mortality rate of 61 per cent represents the unexploited condition—four years of commercial fishing with 51/2-inch mesh gill-nets produced no obvious change. A moderate mortality rate acting at all ages will easily account for thousands of eggs being produced for every whitefish that survives to maturity—it is unnecessary to assume a low percentage of eggs fertilized or excessive mortality among fertilized eggs or among young fish.A more intensive fishery would probably increase sustained yield. |
format |
Article in Journal/Newspaper |
author |
Kennedy, W. A. |
spellingShingle |
Kennedy, W. A. Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
author_facet |
Kennedy, W. A. |
author_sort |
Kennedy, W. A. |
title |
Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
title_short |
Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
title_full |
Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
title_fullStr |
Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
title_full_unstemmed |
Growth, Maturity, Fecundity and Mortality in the Relatively Unexploited Whitefish, Coregonus clupeaformis, of Great Slave Lake |
title_sort |
growth, maturity, fecundity and mortality in the relatively unexploited whitefish, coregonus clupeaformis, of great slave lake |
publisher |
Canadian Science Publishing |
publishDate |
1953 |
url |
http://dx.doi.org/10.1139/f53-025 http://www.nrcresearchpress.com/doi/pdf/10.1139/f53-025 |
long_lat |
ENVELOPE(-114.001,-114.001,61.500,61.500) |
geographic |
Great Slave Lake |
geographic_facet |
Great Slave Lake |
genre |
Great Slave Lake |
genre_facet |
Great Slave Lake |
op_source |
Journal of the Fisheries Research Board of Canada volume 10, issue 7, page 413-441 ISSN 0015-296X |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f53-025 |
container_title |
Journal of the Fisheries Research Board of Canada |
container_volume |
10 |
container_issue |
7 |
container_start_page |
413 |
op_container_end_page |
441 |
_version_ |
1802644601625903104 |