. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 96 CALIFORNIA FISH AND GAME activities on the genetic structure of California coho. Some allele frequency differences may be maintained by selection. Certain transferrin genotypes have been shown to have increased resistance to bacterial kidney disease in specific stocks of coho salmon (Suzumoto et al. 1977, Winter, Schreck, and Mclntyre 1980, Withler and Evelyn 1990). These same genotypes were also shown to be associated with poor gr
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 96 CALIFORNIA FISH AND GAME activities on the genetic structure of California coho. Some allele frequency differences may be maintained by selection. Certain transferrin genotypes have been shown to have increased resistance to bacterial kidney disease in specific stocks of coho salmon (Suzumoto et al. 1977, Winter, Schreck, and Mclntyre 1980, Withler and Evelyn 1990). These same genotypes were also shown to be associated with poor growth and survival in one hatchery (Mclntyre and Johnson 1977). The frequency of transferrin alleles has been shown to vary significantly within the range of coho salmon (Utter, Ames, and Hodgins 1970). A north-south cline in the frequency of the TFN-(103) allele exists between samples from California and Oregon (Fig. 3); average frequencies of the allele in Olin's (1984) collections and ours were and , respectively. Oregon also has had an extensive program of stock transfers within the State (Olin 1984). The fact that this cline exists, in spite of the homogenizing effects of stock transfers, may indicate a selective advantage for certain transferrin genotypes in California. Transferrin expression on starch gels requires that the plasma be extracted from fresh blood and frozen prior to electrophoresis. Unfortunately, we were unable to score this locus for many of our collections because whole blood was frozen. With incomplete allele frequency data and vague stocking records, it is difficult to u c <i) n u \. 0 8 0 e 0,4 - 0,2. I ' I I I I 1 I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and
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