Bacteriocins Contributing in Rhizospheric Competition among Fluorescent Pseudomonads

The study was conducted in the hatchery complex of Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacha, Khulna, Bangladesh. The body weights of collected male fishes were ranged from 42-50 g and that of female fishes were from 50-58 g. The fish were divided into different groups, which were administered with different hormones: Pituitary Gland (3, 4 & 5 Mg of dried PG/Kg of both male and female fish), Human Chorionic Gonadotropin (2500, 3000 & 3500 IU of HCG/Kg of both male and female fish), Synthetic gonadotropin releasing hormone analogue (25, 30 & 35 Microgram of S-GnRHa/Kg), Only the group treated with S-GnRHa hormone exhibited spawning activity. Only 25, 30, 35 Microgram of S-GnRHaa (Ovupin)/Kg of dose injected fish showed spawning activity. In 25 Microgram/Kg S-GnRHa hormone dose, the spawning period, fertility rate, hatching period and hatching rate of green back mullet were 33-35 hrs, 72%, 21-24 hrs and 70%. In 30 Microgram/Kg S-GnRHa hormone dose, the spawning period, fertility rate, hatching period and hatching rate green back mullet were 33-35 hrs, 83%, 21-24 hrs, 81%. In 35 Microgram/Kg S-GnRHaa hormone dose, the spawning period, fertility rate, hatching period and hatching rate of green back mullet were 32-34 hrs, 80%, 20-22 hrs, 76%. All dose of S-GnRHa here shown more or less similar result. The present study might be useful for quality seed production on parse (Chelon subviridis) during induced breeding in hatcheries.