Abstract
In ornamental carps from the collection of the Experimental Station, All-Russia Research Institute of Fresh-Water Fisheries, fish with a dirty dark tint of body color among orange and white fish were found. This coloration was shown to be due to the presence of black pigment cells in the lower skin layer. In the outer skin layers these cells were almost entirely absent. This color type was found to be determined by the presence of at least one of alleles B1' or B2' of digenic system B1, B2, which is responsible for the development of melanophores in fish skin. Each of the genes of this digenic system is represented by three alleles with the following order of dominance: B > B' > b.
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