Effect of Probiotics on the Hatchery Seed Production of Black Tiger Shrimp, Penaeus monodon (Fabricius)

In recent years, the diseases of shrimps hindered the development of shrimp culture. Hence, the use of probiotic bacteria in aquaculture has tremendous scope and the study of the application of probiotics in aquaculture has a glorious future. In the present study, the probiotics was applied (experimental) for the larval rearing of P. monodon which is compared with control tanks (without probiotics). The temperature and alkalinity of both control and experimental tanks were more of less same. The pH of the control tank was 8.4 and the experimental tank was 8.2.The dissolved oxygen was higher in experimental tank (6.12ml/litre) and lower in control tanks (5.75ml/litre). Likewise, the ammonia was higher in control tanks (0.19 mg/litre) rather than experimental tanks (0.15mg/litre). The survival rate of different larval stages (nauplii, zoea and mysis) were maximum in the present study than that of control tanks. The final survival rate of the post larvae from the control and experimental tank was 70 and 30% respectively. The average length of all post larvae was maximum when reared in experimental tank than control tanks. The general conclusion obtained from the present study is that the probiotics plays a vital role in maintaining water quality parameters throughout the larval cycle. It is clear from the microbial load data that vibrio sp. is dominant in the control tanks than in experimental tanks.