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Some factors influencing the trends of salmon populations in Oregon

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dc.creator McKernan, Donald L. (Donald Lynn), 1918-1979
dc.creator Johnson, Donald R.
dc.creator Hodges, John I.
dc.creator Oregon. Fish Commission
dc.date.accessioned 2006-08-23T18:07:10Z
dc.date.available 2006-08-23T18:07:10Z
dc.date.issued 1950
dc.identifier.other http://ir.library.oregonstate.edu/dspace/bitstream/1957/2949/1/Factors_Trends_Salmon_ocr.pdf
dc.identifier.uri http://hdl.handle.net/1957/2949
dc.description.abstract Three factors were found to be significantly correlated with the fluctuations and trends in silver salmon production in Oregon. Logging was found to adversely affect the runs of salmon in later years. Exceptional winter floods seem to produce poor resulting runs. Low summer water flows also appear to produce lower than average runs on some rivers, while higher summer flows appear to be followed by an increase in the resultant runs. The intensity of fishing was also found to affect the subsequent productivity of the fisheries. Increases in fishing effort on the rivers studied were followed in succeeding cycles by a lower catch, and when the fishing effort declined the ensuing production of silver salmon generally increased. Other factors studied did not bear a significant relationship to the fluctuations or trends of productivity of silver salmon. en
dc.description.tableofcontents Introduction -- Trend of population -- Possible causes of the observed fluctuations and decline -- Relationship between fishing and population trends -- Summary -- Conclusions -- Acknowledgments -- Literature cited. en
dc.format.extent 4213920 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Portland, Or. : Oregon Fish Commission en
dc.relation.ispartofseries Contribution (Oregon Fish Commission) en
dc.relation.ispartofseries no. 12 en
dc.subject Thematic Classification -- Plants and Animals -- Fish -- Anadromous Fish en
dc.subject Thematic Classification -- Habitats and Vegetation -- Aquatic Habitats -- River and Stream Aquatic Habitat en
dc.subject.lcsh Coho salmon -- Oregon en
dc.title Some factors influencing the trends of salmon populations in Oregon en
dc.type Technical Report en
dc.description.peerreview no en
dc.coverage.spatialstates Spatial: States -- Oregon en

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