The lsraeli Joumal of Aquaculture - Bamidgeh 50(3), 1998, 134-139

STUDIES ON THE INHERITANCE OF BLACK PATCHES
IN ORNAMENTAL (KOI) CARP


Boris Gomelsky

Department of Fisheries, Ministry of Agriculture and Rural Development, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel, 30820, Israel

Nina Cherfas

Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, Dor, D.N. Hof Hacarmel 3082O, Israel

Gideon Hulata

Department of Aquaculture, Institute of Animal Science, Agricultural Research Organization, Volcani Center. P.O. Box 6, Bet Dagan 50250, Israel

(Received 27.9.97, Accepted 20.6.98)

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 BIbi). Crosses between them resulted in a segregation of 3:1 (pigmented:unpigmented), while their crossing with white-red koi (without black patches; genotype bIbIi) resulted in a segregation of 1:1. One F1 male with the genotype BIBI 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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