INDUCED BREEDING AND FRY NURSING OF MYSTUS VITTATUS (BLOCH 1797)

The work is related to optimization of PG dose and survivability of the spawn of Mystus vittatus in the tank nursery at Arabpur Fish Farm in Jessore, Bangladesh during 2000 to 2002. Trial doses of PG used for induced breeding of M. vittatus were 1 to 4 mg PG in the first dose and 4 to 8 mg in the second dose for female. On the other hand, the male fishes were administered only a single trial dose of 2, 3 and 4 mg PG. Induced breeding was successfully done in M. vittatus with 3 mg of PG kg-1 body weight in first dose and 6.0 mg PG in second dose for female and a single dose of 3 mg PG for male for virgin fish, F1 and F2 generation. The tank nursery performance of the fry was studied in regard to length, weight, production and survivability rate. Live animal feeds (rotifers) were used. The highest growth and survivability of the fish fry was obtained by using rotifers of 40 cumm-1 and 20 cumm-1, respectively.