First record of induced breeding and fry production techniques of Pialy fish, Aspidoparia jaya (Hamilton, 1822) in Bangladesh

This experiment was conducted for the development of induced breeding techniques of Aspidoparia jaya using the pituitary gland (PG) extract at the Floodplain Sub-station, BFRI, Santahar, Bogura, Bangladesh. Three breeding trials were conducted in May, June and July, 2021 where in May, none of the fish was ovulated. But breeding response was observed in June and July when we applied 8 mg (T1), 10 mg (T2) and 12 mg (T3) PG/kg body weight of female, and 5 mg (T1), 6 mg (T2) and 7 mg (T3) PG/kg body weight of male fish. Among all the treatments, significantly (P<0.05) highest breeding performance in terms of ovulation rate (78.87±1.71%), fertilization rate (79.39±1.40%) and hatching rate (86.98±1.20%) were observed in T3 treatment in the month of July when injected with single dose of 12 mg and 7 mg PG/ kg body weight of female and male, respectively. Significantly (P<0.05) higher values of mean gonado-somatic index were observed during June, July, August, December and January for females where July (10.15±1.50%) and January (9.55±1.30%) showed the highest peaks which indicated that they might be spawn twice in a year (from May to August and from December to January). The results from the present experiment reveals that induced breeding of Aspidoparia jaya, using PG extract is successful which might be helpful for the large-scale seed production of this species for the aquaculture as well as to conserve the species from being extinct from the biodiversity.