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A mark-recapture experiment was used to estimate total escapement of coho salmon Oncorhynchus kisutch returning to Steep Creek, a tributary of Mendenhall Lake located in the upper Mendenhall River drainage near Juneau, Alaska during the fall of 1996. Three-hundred and forty-four unique coho salmon were captured in beach seines and dipnets between 30 September and 15 November. All were marked with uniquely numbered anchor tags and given a secondary mark consisting of an opercle punch. Between 6 October and 23 November, 637 fish were inspected for marks, many of which having already been captured, and of these, 342 (50%) had a primary or secondary mark present. The Jolly-Seber model was used to estimate a total escapement of 477 (SE=37) coho salmon. In addition, 5 weekly estimates of abundance were calculated as 201, 170, 176, 230, and 135 coho salmon corresponding to weeks 2-6 (6-12 October through 3-9 November). As part of regular escapement monitoring activities, three foot surveys were conducted between 8 October and 31 October to count the number of coho salmon observed in a single day at Steep Creek. The peak observer count was 134 on 8 October, representing 28% of the estimated total escapement. In addition to these counts, other ADF&G personnel made foot counts and from these, the highest observer count was 151 (29 October), representing 32% of the total escapement. On average, observers underestimated the weekly abundance of fish by a mean relative bias of -50%.
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Subjects
Statistics, Fishes, Coho salmon, Fish taggingPlaces
Steep Creek, AlaskaShowing 1 featured edition. View all 1 editions?
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1
Relationship between observer counts and abundance of coho salmon in Steep Creek, northern southeast Alaska in 1996
1997, Alaska Dept. of Fish and Game, Division of Sport Fish, Research and Technical Services
in English
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Book Details
Edition Notes
"October 1997"
Includes bibliographical references (p. 19-20)
Also issued online.
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Feedback?January 20, 2010 | Edited by WorkBot | add subjects and covers |
December 11, 2009 | Created by WorkBot | add works page |