Author(s): Isa Usman, Jehu Auta, Shuaibu Akpai Abdullahi

Abstract: The effect of monthly variation in water temperature on artificial breeding of common carp, Cyprinus carpio using ovaprim as an ovulation stimulator was studied. A total of eighteen (18) common carp broodstock were divided into three (3) groups. Each group had three (3) males and three (3) females, they were induced with ovaprim in three different months viz; January, February and March with corresponding water temperature of 23±1, 26±1 and 29±1 °C respectively. The result revealed that latency period decreases with increase in temperature, at 23±1 °C latency was found to be 16.55±0.13 hrs, at 26±1 and 29±1 °C latency was 13.00±0.13 and 11.32±0.07 hrs respectively. Temperature has a significant effect (p≤0.05) on fertilization and hatchability. C. carpio performed best in terms of fertilization (89.00±3.00%) and hatchability (67.50±2.50%) at the temperature of 26±1 °C. Increase in temperature leads to decrease in the hatching duration of C. carpio eggs, hatching duration was found to be 41.96±0:42 hrs at the temperature of 23±1 °C, at 26±1 °C hatching duration was 37.18±0:04 hrs and 28.98±0.96 hrs at 29±1 °C. It is therefore recommended that the temperature of 26±1 °C be used during artificial breeding of C. carpio in Nigeria.

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