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Age, length and weight studies of three species of Columbia River salmon (Oncorhynchus keta, O. gorbuscha and O. kisutch)

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dc.creator Marr, John C.
dc.creator Oregon. Fish Commission
dc.date.accessioned 2006-08-24T20:46:58Z
dc.date.available 2006-08-24T20:46:58Z
dc.date.issued 1944
dc.identifier.other http://ir.library.oregonstate.edu/dspace/bitstream/1957/2972/1/Age_Length_Weight_Studies_Salmon_ocr.pdf
dc.identifier.uri http://hdl.handle.net/1957/2972
dc.description.abstract Samples, consisting of scales, length and weight measurements, and sex determinations of chum, pink, and silver salmons, were taken from the commercial catch in the Columbia River in 1914. Five hundred eighteen chum scales were examined. All fish had gone to sea early in their first year; and 70.5 percent had returned in their third year, 28.7 percent in their fourth, and 0.8 percent in their fifth. Growth curves, based on scale and fish measurements, are given for all sex-age groups. The length-weight relationship may be expressed by the equation Weight = 0.0001378 x Length [superscript 2.6004]. Tendencies were noted, during the course of the run, for older fish and for males to be relatively more abundant in the earlier portions of the run. In comparisons with data from other localities, it was demonstrated that, from south to north: (1) there is a decrease in mean length at the same age; (2) older fish are progressively more abundant; and (3) the runs are progressively earlier. Pink salmon are uncommon in the Columbia River, and only six were examined. All had gone to sea early in their first year, and all had returned in their second year. Eight hundred eighty-five silver salmon scales were examined. Of the total, 6.1 percent had gone to sea early in their second year, and returned late in their second year (2 [subscript 2]); 0.3 percent had gone to sea early in their third, and returned late in their third (3 [subscript 3]); 83.9 percent had gone to sea in their second, and returned in their third (3 [subscript 2]); and 9.7 percent had gone to sea in their third year, and returned during their fourth year (4 [subscript 3]). Growth curves are given for all, age groups. The length-weight relationship may be expressed by the equation Weight = 0.0000373 x Length [superscript 2.8945]. As in the case of the chums, changes were noted during the run in the sex ratio and the percentage of age classes. Comparison with data from other localities revealed south-to-north changes in size and in abundance of different age groups, similar to those demonstrated for the chums. It is felt that the differences between races of a single river system will prove to be of the same nature as those here demonstrated between populations of different river systems. Knowledge of the differences between the races of salmons entering the Columbia River may be of extreme importance in the management of the fisheries. en
dc.description.tableofcontents Introduction -- Acknowledgments -- Chums -- Pinks -- Silvers -- Summary -- Literature cited. en
dc.format.extent 33688802 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Salem, Or. : Department of Research, Fish Commission of the State of Oregon en
dc.relation.ispartofseries Contribution (Oregon Fish Commission) en
dc.relation.ispartofseries no. 9. en
dc.subject Thematic Classification -- Plants and Animals -- Fish -- Anadromous Fish -- Chum Salmon en
dc.subject Thematic Classification -- Plants and Animals -- Fish -- Anadromous Fish -- Coho Salmon en
dc.subject.lcsh Chum salmon -- Columbia River en
dc.subject.lcsh Coho salmon -- Columbia River en
dc.subject.lcsh Pink salmon -- Columbia River en
dc.subject.lcsh Chum salmon -- Age -- Columbia River en
dc.subject.lcsh Coho salmon -- Age -- Columbia River en
dc.subject.lcsh Pink salmon -- Age -- Columbia River en
dc.subject.lcsh Chum salmon -- Columbia River -- Weight en
dc.subject.lcsh Coho salmon -- Columbia River -- Weight en
dc.subject.lcsh Pink salmon -- Columbia River -- Weight en
dc.title Age, length and weight studies of three species of Columbia River salmon (Oncorhynchus keta, O. gorbuscha and O. kisutch) en
dc.type Technical Report en
dc.description.peerreview no en
dc.coverage.spatialoregonplanbasins Spatial: Oregon Plan Basins -- Lower Columbia en
dc.coverage.spatialstates Spatial: States -- Oregon en
dc.coverage.spatialstates Spatial: States -- Washington en
dc.relation.reportsandpublications Reports and Publications -- Other Reports and Publications en
dc.coverage.spatialhydrologiclowercolumbia Spatial: Hydrologic Units -- Pacific Northwest (17) -- Lower Columbia (1708) -- Lower Columbia (170800) en
dc.coverage.spatialhydrologicmiddlecolumbia Spatial: Hydrologic Units -- Pacific Northwest (17) -- Middle Columbia (1707) -- Middle Columbia (170701) en


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