Applied research of Bacillus licheniformis De in grass carp (Ctenopharyngodon idellus) culture

Effects of Bacillus licheniformis De on grass carp (Ctenopharyngodon idellus) culture were analyzed with indexes including fish survival rate, pH, water transparency, dissolve oxygen, ammonia nitrogen and nitrite nitrogen. The results showed that the survival rate, pH and water dissolve oxygen of test groups increased 3.2%, 3.9%, 25.5%, respectively, but water transparency, ammonia nitrogen and nitrite nitrogen decreased 38.5%, 74.6%, 69.3%. In conclusion, the productive efficiency, assessment indexes and environmental quality in test groups all optimized in a certain extent.