Co-Authors:
Gomelsky, B., Department of Fisheries, Min. of Agric. and Rural Development, Fish and Aquacult. Res. Station, Dor, D.N. Hof Hacarmel, 30820, Israel, Aquaculture Research Center, Kentucky State University, Frankfort, KY 40601, United States
Cherfas, N., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, Dor, D.N. Hof Hacarmel, Israel
Hulata, G., Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Abstract:
The ratio of fish with and without black pigmentation was determined in 22 amphimictic, two meiotic gynogenetic and two mitotic gynogenetic progenies produced from koi parents of different color types. The results of analysis of the amphimictic progenies confirmed the proposed earlier hypothesis that the development of black patches in koi is controlled by one dominant gene (Bl). Koi parents with black patches (white-red-black and white-black) proved to be heterozygotes for a gene determining black pigmentation (genotype Blbl). Crosses between them resulted in a segregation of 3:1 (pigmented:unpigmented), while their crossing with white-red koi (without black patches; genotype blbl) resulted in a segregation of 1:1. One F1 male with the genotype BlBl was identified by performing test crosses. The segregation of fry in gynogenetic progenies depended on the type of gynogenesis, and generally fitted the expected ratios. The results of gynogenetic experiments also confirmed the occurrence of the Bl gene.
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