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Report: Mean Smolt Age Estimation and Under Aging Bias of Nass River Steelhead Populations
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In the Nass River watershed, juvenile and adult steelhead scales were collected to summarize the mean smolt ages for major summer and winter steelhead populations and to investigate the lack of the first year annulus formation which results in under aging bias.
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Author: Cascadia Natural Resource Consulting
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Old Reference Number: sk117
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Date Published: Aug 1998
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Report ID: 2616
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Audience: Government and Public
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In the Nass River watershed, juvenile and adult steelhead scales were collected to summarize the mean smolt ages for major summer and winter steelhead populations and to investigate the lack of the first year annulus formation which results in under aging bias. The mean smolt age and potential aging biases were investigated because it was an influential parameter to the Nass River steelhead production model. Comparisons of otolith and scale ages indicated there was no under aging of juvenile steelhead, since the ages had 100 percent correspondence. However, the results indicated some adult steelhead scales may be missing the first year annulus because on juvenile steelhead some scales from a fish were missing the first year annulus whereas other scales from the same fish exhibited the first year annulus. Thus the large number of scales collected from juveniles permitted the exclusion of scales obviously missing the first year annulus.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Steelhead - Oncorhynchus mykiss |
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Region - Skeena |
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Fish and Fish Habitat - Fish Inventory |
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Fish and Fish Habitat - Management |
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Watershed Groups - 500 - Nass River |
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