Principles of Genetics and Breeding

5.1.1.2 Sterility

• Grass carp (Ctenopharyngodon idella) x bighead carp (Aristichthys nobilitrix) hybrid.
• Grass carp may serve to control higher vegetation in aquatic systems. In some areas this introduction is not permitted for fear that this uncontrolled reproduction may eradicate aquatic plant growth.
• Grass carp x bighead carp hybrids were produced in order to generate sterile, grazing fish.
• Most of these hybrids were sterile triploids.
• But they are not considered suitable for controlling aquatic vegetation because the grazing rate of hybrid is much lower than that of grass carp.
• The intergeneric hybrids between common carp and the Indian major carps (common carp x catla, common carp x rohu and common carp x mrigal) were also found to be triploid and sterile.