Further Evidence of Chromosome Abnormalities in Normal and Haploid Gynogenetic Progenies of Rainbow Trout, Oncorhynchus mykiss

Abstract

Gynogenetic haploid progenies of rainbow trout, produced using UV light for sperm inactivation, were studied in comparison with normal progenies. In a total of 437 normal embryos, 3.5% of them showed chromosome abnormalities: 1.1% haploids, 1.8% triploids, and 0.4% tetraploids. In the haploid embryos, 90.6% showed NF=52 and 9.4% showed other NF (50, 51, 53, or 54); chromosome numbers for embryos with NF=52 were 28, 29, 30, and 31; two to three different chromosome numbers were observed in each progeny. Chromosome abnormalities in normal progenies seem to be a common phenomenon. Results from haploid progenies suggest that aneuploidy occurs during female meiosis.