Induced breeding of crucian carp, Carassius carassius was conducted in order to determine the optimum dose of pituitary gland (PG) hormone. The research was done at the hatchery of the Freshwater Station, Bangladesh Fisheries Research Institute, Mymensingh. The study was consisted of four different doses of PG treatments (T 1 , T 2 , T 3 and T 4 ) with three replications of each. In the experiment single dose was used for T 1 while double dose used for T 2 , T 3 and T 4 to evaluate the efficiency of PG hormone on ovulation, fertilization and hatching rates of C. carassius eggs. Single dose of 6.0 mg PG kg -1 body weight (bw) of female fish had no ovulatory response. The double dose in case of female fish in T 2 at the rate of 6.0 mg PG kg -1 bw (1 st dose 1.0 and 2 nd dose 5.0 mg PG kg -1 bw at 6 h interval) and 2.0 mg PG kg -1 bw of male fish (single dose during the time of 2 nd injection of female) in January showed better results in terms of ovulation (96.52±1.53%), fertilization (90.35±1.67%) and hatching rates (78.65±2.84%) compared to other treatments. Considering ovulation, fertilization and hatching rates the double dose of 6.0 mg PG kg -1 bw of female and single dose of 2.0 mg PG kg -1 bw of male can be used in induced breeding of C. carassius during January. The findings of this study indicated that induced breeding of C. Carassius is successful through PG extract and might be useful for large scale seed production in the hatchery operation.

A three and half month study was undertaken to evaluate the effect of culture management and stocking density on the growth and survival of Penaeus monodon in semi-intensive system of farming. Three treatments with stocking densities of 20 PL/m 2 , 25 PL/m 2 and 30 PL/m 2 wereapplied and considered as treatment T 1 , T 2 and T 3 , respectively. All the ponds were supplied with commercial pelleted feed of different grades and amount (ranging from 10 to 2.8 percent of total biomass weight) based on the age and growth of shrimp. A significant (p<0.05) higher production (3876.66 kg/ha) was obtained from T 2 and the study showed a positive correlation between the culture managed of shrimp farm and the shrimp production and an inverse relation between stocking density and survival rate.