The induced breeding of common carps (Cyprinus carpio) in Bangladesh

The study was conducted to know the induced breeding technique of common carp verities. Scale carp (C. carpio var. communis), mirror carp (C. carpio var. specularis) and leather carp (C. carpio var. nudus) are chosen for the experiment at Ma-Fatema Fish Hatchery in Jessore from January to March, 2016. For induced breeding practice of common carps generally 1st dose of PG hormone only injected to the female brood fishes only. After 6 hours of the 1st dose, female brood fishes were injected with the 2nd dose of hormone at 4 mg PG/kg body weight and male brood fishes were injected at 2 mg PG /kg body weight for scale carp and mirror carp; 4 mg PG/kg body weight for leather carp. After 6-7 hours of injection of 2nd dose brood fishes became ready to spawn. The fertilized eggs were hatched after 42-48 hours. The mean ovulation rates were 90.01±2.55, 85.75±4.3 and 78.98±5.85 for scale carp, mirror carp and leather carp, respectively. The mean fertilization rates were 83.06±3.04, 81.54±3.61 and 79.88±5.35 for scale carp, mirror carp and leather carp, respectively. The mean hatching rates were 77.6±3.93, 76.16±2.91 and 74.59±4.65 for scale carp, mirror carp and leather carp, respectively. The mean survival rates were 73.44±4.94, 71.92±1.94 and 69.58±3.79 for scale carp, mirror carp and leather carp, respectively. This is first research work on comparative study of common carps induced breeding in Bangladesh.