The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters
The ovaries of 113 walleye pollock from a resident stock in the Strait of Georgia, British Columbia were examined for determination of fecundity. Oocytes were sized and counted in 20 μm intervals of diameter. Without exception, ovaries contained a pronounced bimodal distribution of oocyte diameters...
Published in: | Journal of Fish Biology |
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Language: | English |
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Wiley
1985
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1985.tb04035.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1985.tb04035.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1985.tb04035.x |
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crwiley:10.1111/j.1095-8649.1985.tb04035.x 2024-06-02T08:15:15+00:00 The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters Mason, J. C. 1985 http://dx.doi.org/10.1111/j.1095-8649.1985.tb04035.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1985.tb04035.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1985.tb04035.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 27, issue 3, page 335-346 ISSN 0022-1112 1095-8649 journal-article 1985 crwiley https://doi.org/10.1111/j.1095-8649.1985.tb04035.x 2024-05-03T11:09:13Z The ovaries of 113 walleye pollock from a resident stock in the Strait of Georgia, British Columbia were examined for determination of fecundity. Oocytes were sized and counted in 20 μm intervals of diameter. Without exception, ovaries contained a pronounced bimodal distribution of oocyte diameters with peaks at 100 and 400–600 μm. Oocytes ≥ 180 μm diameter were undergoing trophoplasmic growth leading to hydration. ‘Apparent’ fecundity is defined as the estimated number of yolked oocytes ≥ 180 μm diameter, regardless of potential resorbtion. Previous workers have not shown that significant resorbtion takes place in the post‐spawned ovary. Total oocyte complement (≥40μm diameter) was best expressed by a linear model where F t = 33004 f.l. – 869627, where f.l. = fork length in cm and r = 0.86. Estimates of F t , ranged from 117700 to 1394 100 oocytes ≥40μm. Age was weakly related to fecundity, reflecting large individual differences in annual growth after age 4 years. Apparent fecundity best suited a linear model where F a = 23522 f.l. – 599713 and r = 0.91. Estimates of F a fell within the range 58 379–1 151 527. Relative fecundity (eggs g −1 ) decreased over most of the length range encountered in the sample. The average‐sized female in Georgia Strait is twice as fecund as her counterparts in the north‐western Pacific Ocean, containing some 390 000 to 420 000 oocytes 7ge;180 μm diameter compared to about 200 000 oocytes in a north‐western female of comparable length. Article in Journal/Newspaper Theragra chalcogramma Wiley Online Library Pacific Journal of Fish Biology 27 3 335 346 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The ovaries of 113 walleye pollock from a resident stock in the Strait of Georgia, British Columbia were examined for determination of fecundity. Oocytes were sized and counted in 20 μm intervals of diameter. Without exception, ovaries contained a pronounced bimodal distribution of oocyte diameters with peaks at 100 and 400–600 μm. Oocytes ≥ 180 μm diameter were undergoing trophoplasmic growth leading to hydration. ‘Apparent’ fecundity is defined as the estimated number of yolked oocytes ≥ 180 μm diameter, regardless of potential resorbtion. Previous workers have not shown that significant resorbtion takes place in the post‐spawned ovary. Total oocyte complement (≥40μm diameter) was best expressed by a linear model where F t = 33004 f.l. – 869627, where f.l. = fork length in cm and r = 0.86. Estimates of F t , ranged from 117700 to 1394 100 oocytes ≥40μm. Age was weakly related to fecundity, reflecting large individual differences in annual growth after age 4 years. Apparent fecundity best suited a linear model where F a = 23522 f.l. – 599713 and r = 0.91. Estimates of F a fell within the range 58 379–1 151 527. Relative fecundity (eggs g −1 ) decreased over most of the length range encountered in the sample. The average‐sized female in Georgia Strait is twice as fecund as her counterparts in the north‐western Pacific Ocean, containing some 390 000 to 420 000 oocytes 7ge;180 μm diameter compared to about 200 000 oocytes in a north‐western female of comparable length. |
format |
Article in Journal/Newspaper |
author |
Mason, J. C. |
spellingShingle |
Mason, J. C. The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
author_facet |
Mason, J. C. |
author_sort |
Mason, J. C. |
title |
The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
title_short |
The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
title_full |
The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
title_fullStr |
The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
title_full_unstemmed |
The fecundity of the walleye pollock, Theragra chalcogramma (Pallas), spawning in Canadian waters |
title_sort |
fecundity of the walleye pollock, theragra chalcogramma (pallas), spawning in canadian waters |
publisher |
Wiley |
publishDate |
1985 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1985.tb04035.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1985.tb04035.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1985.tb04035.x |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Theragra chalcogramma |
genre_facet |
Theragra chalcogramma |
op_source |
Journal of Fish Biology volume 27, issue 3, page 335-346 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1985.tb04035.x |
container_title |
Journal of Fish Biology |
container_volume |
27 |
container_issue |
3 |
container_start_page |
335 |
op_container_end_page |
346 |
_version_ |
1800739357810753536 |