Technical Report

 

Spawning fish surveys in coastal watersheds, 1971 Public Deposited

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https://ir.library.oregonstate.edu/concern/technical_reports/1g05fc341

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  • The surveys of spawning fish in coastal rivers in 1971 indicate that stocks of chum salmon remain at a low, although apparently stabilized level. Fluctuations are probably the result of year-class survival and age at maturity, rather than continued decline of the species. The fall chinook index of abundance was only 78% of the long-term average. The counts were low in all but one of the standard survey water­sheds and in both auxiliary survey river systems so it can be presumed that the surveys accurately reflected a decreased escapement. The coho index of abundance equaled its long-term average indicating a generally adequate spawning density. The Tenmile Lakes run looks particu­larly promising because a near record number of eggs were deposited by the escapement this year. However, the low number of jacks returning this year suggests the number 0£ adults returning next year will be considerably reduced.
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  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Susan Gilmont (susan.gilmont@orst.edu) on 2012-01-26T18:45:12Z No. of bitstreams: 1 SpawningFishSurveys1971.pdf: 1219128 bytes, checksum: 42311abd07a5bfd80f4c43c840b4d0de (MD5)
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