Computation of Migratory Timing Statistics for Adult Chinook Salmon in the Yukon River, Alaska, and Their Relevance to Fisheries Management
- 1 October 1982
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 2 (4) , 359-370
- https://doi.org/10.1577/1548-8659(1982)2<359:comtsf>2.0.co;2
Abstract
An objective definition of migratory timing is applied to commercial and test fishing catch data for chinook salmon (Oncorhynchus tshawytscha) from the Yukon delta, 1961-1980. On the average, 91% of all the commercial catch is taken before the end of June, with one-half of the catch being taken by June 21. The middle part of the migration (25-75%) usually is available for harvest only over a span of 11 days. However, the length of the central span has varied from 8 to 13 days, depending on timing. Mean dates of migration based on catch and CPUE data were nearly identical (about June 21), with range limits of June 12-30. Test fishing and commercial catch data for 1963-1978 showed no significant difference (α = 0.05) for the mean date of migration. The spread of the migration (variance) appears to be inversely proportional to the mean date of migration for early and late migrations. Timing of migration may be dependent on factors related to air temperature.Keywords
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