నైరూప్య

CAPTIVE BREEDING OF BANDED GOURAMI, COLISA FASCIATA (BLOCH AND SCHNEIDER, 1801); CONSIDERING THE VARIOUS HORMONAL RESPONSES

Md. Sherazul Islam*, Sharmin Rikta and Sudipta Ghosh

The banded gourami, Colisa fasciata has high food as well as ornamental value in Bangladesh and demanded species to domestication due to rapid declination of natural population. The spawning performance of C. fasciata was investigated by using different hormones in the captive aquarium condition. There were three treatments conducted such as induce breeding using PG (T1), HCG (T2) and ovaprim (T3). Each treatment had two more replications. In each aquarium, single pair of brood was stocked. The water parameter ranged such as temperature, pH and DO were 26-29º C, 7.2-8.5 and 3.5-4.5 mg/l respectively. Hormones were administered into female in two doses; a lower priming dose followed a 6 h interval by a higher resolving dose. In first dose, PG, HCG and Ovaprim were injected in female at 10 mg/kg, 400 IU/kg and 0.5 ml/kg of body weight respectively. The second dose was applied to both male and female and female received double amount than the male. Among the three treatments, 100% spawning occurred at T1 and T3 after 11 and 16 h respectively. Fertilization rate was 76.7 ± 4.71%, 46.7 ± 9.43% and 86.6 ± 9.43% in case of T1, T2 and T3 respectively. The larvae was hatch out after 23-26 h of spawning and hatching rate was 46 ± 1.41%, 34 ± 2.83%, and 52 ± 3.54% in T1, T2 and T3 respectively. It is indicated that the use of ovaprim (T3) was more effective in induction of ovulation, fertilization rate and hatching rate compared to other spawning stimulants for C. fasciata.