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Abstrakt
Successful Induced Breeding of a Bagrid Catfish, Mystus Dibrugarensis in Captive Condition
Bhenila Bailung and Biswas SP
Four induced breeding exercises on the Bagrid catfish species, Mystus dibrugarensis were conducted in Chinese circular eco hatchery system. Experiment was conducted in two conditions. One in breeding pool (marked as A) with continuous showering of water and another was one in round tank having duck mouth at floor (marked as B) and maintaining a mild water circulation. Synthetic hormone, ovaprim was used to induce the species at different doses (0.4-0.6 mg/kg) in each breeding trial. Spawning was observed after a latency period of 5-8 h under an optimum temperature ranged of 27-29°C. Dissolved oxygen level was found different in both experimental conditions. The egg output was recorded in tank ‘A’ was 2786-4765 no. and tank ‘B’ was 1217-1893 no. Fertilization rate was recorded between 34.83-77.54% in tank ‘A’ and 55.87-58.32%. Hatching rate was also recorded as 20.61-74.32% in tank ‘A’ and 41.49-46.06% in tank ‘B’.