Effect of probiotics on growth and survival of post larvae of giant freshwater prawn, Macrobrachium rosenbergii (de man)
Author(s): Shailender M*, Krishna P. V., Suresh Babu Ch.
Abstract
The trend of using probiotics in aquaculture is increasing due to research results indicating their ability to increase production and prevent disease in farm animals. The development of suitable probiotics for bio-control in aquaculture would result in less reliance on chemicals and antibiotics and result in a better environment. The production of high quality larvae in scampi is very difficult, since the disease out breaks are the major constraints in scampi hatcheries. Controlling diseases through antibiotics has been widely criticized for their negative impacts, so alternate methods needed to be developed to produce high quality scampi larvae. Application of water probiotics, soil probiotics and reduction of salinity are the methods gaining importance in controlling pathogen in scampi larvae. The larval rearing tanks are divided into four chambers for our convenience. The probiotics treated tanks are considered as experimental and without probiotics treated are considered as control. The water probiotics namely C.P (Super Biotic) and Biodream (Probiotic contains Bacillus sp. and Streptococcus sp.) was added in the experimental tanks alone @ 5ppm each @ 5- 10 ppm from Zoea stage-II onwards and probiotics Zymatin @ 5ppm was added after the appearance of post larval stage in experimental tanks. In addition to probiotics 0.05 ppm of Treflan was also added both experimental and control tanks to prevent the fungal disease. Water temperature, pH, dissolved oxygen, NH3 and H2S were found better in trials with probiotics. In this experiment the survival rate of the nauplii of both control and experimental tanks were more or less same. The survival rate of Zoea reared in the experimental tanks was higher (84%) than that of control tanks (62%). The survival rate of all the post larval stages (PL 1- PL-10) was higher in experimental tanks than that of control tanks. Water quality parameters are also influenced by the addition of probiotics, in this experiment the dissolved oxygen was higher in experimental (6.10 ppm) and lower in control tank (5.50 ppm). The alkalinity (120 ppm) in both control and experimental tank is more or less similar. The Ammonia was higher in control tanks (0.15 ppm) compared experimental tanks (0.12 ppm).
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