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Mottled coloration of haploid-diploid and diploid-triploid mosaic amago salmon Oncorhynchus masou ishikawae

Mottled amago salmon Oncorhynchus masou ishikawe with both yellow- and dark-pigmented skin occurred together with typical albino individuals in a commercial farm. Out of 12 mottled fish examined by DNA content flow-cytometry and erythrocytic nucleus size, three were diploid, eight were haploid-diploid mosaic and one was diploid-triploid mosaic. This fact indicates that the mottled coloration might link to polyploid mosaicism. Genotype of diploid and non-diploid cells at the albino locus was estimated in nine mature mottled fish by observing the frequency of wild-type and albino progeny when mating to homozygous albino (aa). One diploid and three haploid-diploid mosaic mottled fish were presumed to have mosaic genotype with both hemizygous ‘a’ and heterozygous ‘Aa’ cells (a/Aa), because the segregation ratio between two phenotypes was 1∶1. Three other haploid-diploid mosaic fish were presumed to have mosaic genotype with both hemizygous ‘a’ and homozygous ‘AA’ cells (a/AA), because of exclusive occurrence of wild-type phenotype in the progeny. The diploid-triploid mosaic mottled fish was presumed to have mosaic genotypes ‘aa/AAA’, ‘aa/AAa’ or ‘aa/Aaa’, because this fish yielded only albino progeny. One diploid mottled fish produced both two phenotypes but albino mebryos appeared with much more frequency than the expectation, when assuming the genotype ‘Aa’. Thus, this fish was considered to have mosaic genotype ‘Aa/aa’.