FISHERY BULLETIN: VOL. 80. NO. 1 



ery and wild stocks are dissimilar. In general, 

 coho salmon stocks from similar environments 

 appear to have similar phenotypes; however, 

 groupings obtained from cluster analyses of 

 coho salmon stocks and corresponding stream 

 systems were dissimilar. This dissimilarity may 

 be a result of our using only a small number of 

 characters for analysis. As additional characters 

 are considered, additional trends may become 

 evident. The characters in this study, in concert 

 with other characters, should be used in future 

 evaluations of genetic similarities between 

 stocks for an eventual characterization of stocks 

 that will ensure effective transplantation. 



In addition to providing information which 

 may be useful for selecting donor stocks for 

 hatchery programs, the results of this study also 

 suggest a potential weakness in hatchery supple- 

 mentation. Selection through hatchery environ- 

 ment and hatchery practices may be changing 

 the overall phenotype of hatchery stocks, as well 

 as the between-year variability of individual 

 genotypes (as we found for transferrin). If these 

 changes result in reduced performance of the 

 donor stocks in other stream systems, practices 

 designed to increase hatchery production must 

 be weighed against the actual benefits to wild 

 production. 



We believe that this study demonstrates a re- 

 lationship between phenotypic characters and 

 certain habitat types. The differences in pheno- 

 type that are attributable to hatchery or wild 

 origin, geographic proximity, and small or large 

 stream systems may provide a first basis for 

 judging the advisability of stock transfers. 



ACKNOWLEDGMENTS 



We express our appreciation to Carl Bond for 

 his suggestions concerning the morphological 

 characters, to Norbert Hartmann for his advice 

 concerning the analysis of the data, to Fred Utter 

 for taking the time to share his knowledge of 

 electrophoresis, and to Al McGie for providing 

 data on the proportion of females on spawning 

 ground surveys. Funds for this project were pro- 

 vided by the Oregon Department of Fish and 

 Wildlife. 



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