XANTORIC VARIETY OF RAINBOW TROUT: STUDIES OF INHERITANCE AND BREEDING VALUE
Stefan Dobosz
The Stanisław Sakowicz Inland Fisheries Institute in Olsztyn, Poland
ABSTRACT. Studies of the inheritance of the atypical Xantoric coloration in rainbow trout reared at the Department of Salmonid Research (DSR) Rutki indicated that this trait is hereditary and controlled by the epistatic interaction of two genes. The dominant allele A responsible for Wild (W) coloration and the recessive allele a responsible for Xantoric (K) coloration occur at locus A. Allele B is responsible for Palomino (P) coloration, and allele b, in a homozygotic state, determines Albino (A) coloration. Locus A is epistatically dominant in relation to locus B. The alleles responsible for Palomino and Albino coloration have a negative pleiotropic impact on the growth and survival of trout. Through the application of gynogenesis, the females from which progeny inherit the Mottled (M) traits were identified for the first time. The data cited indicate that the described mutation is hereditary and related to the occurrence of Xantoric coloration.
Key words: ANDROGENESIS, GROWTH, GYNOGENESIS, HEREDITARY COLORATION, RAINBOW TROUT, TYPES OF COLORATION
CORRESPONDING AUTHOR:
Stefan Dobosz, Instytut Rybactwa Śródlądowego, Zakład Ryb Łososiowatych w Rutkach, 83-330 Żukowo, Tel./Fax: +48 (58) 6818426, +48 (58)6818427; e-mail: dobosz@infish.com.pl