Closed Culture Systems
- Organic waste management
- Photosynthetic bacteria
- Recirculation Aquaculture System (RAS)
We have addressed the problem of detritus management in closed systems using a strain of Bacillus sp. (Detrodigest) from our Probiotic Bacterial Library. Current efforts are directed towards the understanding the fate of probiotics in various aquaculture systems, their dynamics, and the optimization of primary productivity. This includes studies on the direct effect of probiotics on primary productivity and heterotrophic bacterial population, DOM, and the environmental quality as a whole. The final outcome envisaged is a mathematical model, which can be used to develop specific protocols for individual aquaculture systems, based on their inherent dynamics.
Through a project funded by the Department of Biotechnology, Govt. of India, we have developed four nitrifying bacterial consortia, which efficiently oxidize ammonia to nitrate. Their effectiveness has been demonstrated under different conditions in hatcheries. They have been integrated into two reactor systems, namely, In-Situ Stringed Bed Suspended Bioreactors (SBSBR) and Ex – Situ Packed Bed Bioreactors (PBBR) in immobilized form (Patent No. 828/DEL/2000). Research in this area is continuing by way of characterization of the consortia using molecular techniques and studying its biofilm kinetics.
During our studies in natural aquaculture environments, we found that there is a build up of H2S during the culture period. In order to overcome this build up, farmers tend to use a variety of chemicals, which are not conducive for sustainable aquaculture. Therefore, in order to provide a biological remedy to this problem we have embarked on a research programme funded by Indian Council of Agricultural Research to develop a photosynthetic sulphur bacterial system, which will effectively utilize the H2S.
The Centre has developed a technology for Recirculation System in shrimp and prawn seed production. It is a combination of the research outcomes under the various programmes. The major components of the system are nitrifying bioreactors (SBSBR and PBBR), a detritus management system, a biological anti-vibrio preparation, and a probiotic antagonistic bacterial formulation. UV- sterilization unit of the reactor assemblage manages the entry of viruses and fungal pathogens effectively. The technology is offered as a package engineered in such a way that it can be integrated effectively with least disturbance and alternations in the existing infrastructure.