Study of clones of commercial fish

Induced gynogenetic grass carp (Ctenopharyngodon idella ) and silver carp (Hypophthalmichthys molitrix ) were produced by use of ultraviolet rays for common carp sperm inactivation and cold shock for egg diploidization. Examination of serum esterases as genetic markers, demonstrated that the genetic material of induced gynogenetic grass carp and silver crap was from the maternal parent, and was not detected from the paternal parent. Sex reversal experiments were performed on gynogenetic silver carp. Changes of morphology and construction of the gonads resulted.