Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements
The Stikine River in southeastern Alaska supports two principal stocks of sockeye salmon (Oncorhynchus nerka). An expedient means of separating these stocks when they enter freshwater is by egg size and egg mass measurements. Eggs of sockeye that spawn in the Tahltan Lake system are smaller than soc...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/f85-212 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-212 |
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crcansciencepubl:10.1139/f85-212 2023-12-17T10:50:42+01:00 Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements Craig, P. C. 1985 http://dx.doi.org/10.1139/f85-212 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-212 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 11, page 1696-1701 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1985 crcansciencepubl https://doi.org/10.1139/f85-212 2023-11-19T13:39:06Z The Stikine River in southeastern Alaska supports two principal stocks of sockeye salmon (Oncorhynchus nerka). An expedient means of separating these stocks when they enter freshwater is by egg size and egg mass measurements. Eggs of sockeye that spawn in the Tahltan Lake system are smaller than sockeye spawning elsewhere in the Stikine drainage, a difference supported by an independent stock identification method (scale pattern analysis). Tahltan females have only slightly developed ovaries (1–3% of body weight) and small eggs (2.0–3.5 mm) when they enter freshwater; they enter the river earlier (2–3 wk) and travel farther upstream to spawn than non-Tahltan sockeye. The latter group has more developed ovaries (5–16% of body weight) and larger eggs (3.5–6.2 mm) when they enter the river. Thus, an assessment of egg sizes of sockeye caught in the river can provide on-site information about stock composition and run timing. These data and escapement counts at Tahltan Lake indicate that the total escapement to the Stikine in 1983 was 61 000 to 71 000 sockeye of which 45–53% were Tahltan stock and 47–55% spawned eleswhere in the drainage. Article in Journal/Newspaper Stikine River Alaska Canadian Science Publishing (via Crossref) Sockeye ENVELOPE(-130.143,-130.143,54.160,54.160) Stikine ENVELOPE(-131.803,-131.803,56.699,56.699) Stikine River ENVELOPE(-131.839,-131.839,56.654,56.654) Tahltan ENVELOPE(-131.004,-131.004,58.016,58.016) Tahltan Lake ENVELOPE(-131.618,-131.618,57.962,57.962) Canadian Journal of Fisheries and Aquatic Sciences 42 11 1696 1701 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Craig, P. C. Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
The Stikine River in southeastern Alaska supports two principal stocks of sockeye salmon (Oncorhynchus nerka). An expedient means of separating these stocks when they enter freshwater is by egg size and egg mass measurements. Eggs of sockeye that spawn in the Tahltan Lake system are smaller than sockeye spawning elsewhere in the Stikine drainage, a difference supported by an independent stock identification method (scale pattern analysis). Tahltan females have only slightly developed ovaries (1–3% of body weight) and small eggs (2.0–3.5 mm) when they enter freshwater; they enter the river earlier (2–3 wk) and travel farther upstream to spawn than non-Tahltan sockeye. The latter group has more developed ovaries (5–16% of body weight) and larger eggs (3.5–6.2 mm) when they enter the river. Thus, an assessment of egg sizes of sockeye caught in the river can provide on-site information about stock composition and run timing. These data and escapement counts at Tahltan Lake indicate that the total escapement to the Stikine in 1983 was 61 000 to 71 000 sockeye of which 45–53% were Tahltan stock and 47–55% spawned eleswhere in the drainage. |
format |
Article in Journal/Newspaper |
author |
Craig, P. C. |
author_facet |
Craig, P. C. |
author_sort |
Craig, P. C. |
title |
Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
title_short |
Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
title_full |
Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
title_fullStr |
Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
title_full_unstemmed |
Identification of Sockeye Salmon ( Oncorhynchus nerka ) Stocks in the Stikine River Based on Egg Size Measurements |
title_sort |
identification of sockeye salmon ( oncorhynchus nerka ) stocks in the stikine river based on egg size measurements |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/f85-212 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-212 |
long_lat |
ENVELOPE(-130.143,-130.143,54.160,54.160) ENVELOPE(-131.803,-131.803,56.699,56.699) ENVELOPE(-131.839,-131.839,56.654,56.654) ENVELOPE(-131.004,-131.004,58.016,58.016) ENVELOPE(-131.618,-131.618,57.962,57.962) |
geographic |
Sockeye Stikine Stikine River Tahltan Tahltan Lake |
geographic_facet |
Sockeye Stikine Stikine River Tahltan Tahltan Lake |
genre |
Stikine River Alaska |
genre_facet |
Stikine River Alaska |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 11, page 1696-1701 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f85-212 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
42 |
container_issue |
11 |
container_start_page |
1696 |
op_container_end_page |
1701 |
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1785575766139863040 |