Photosynthetic sulphur bacteria (PSB)

In aquaculture systems soil Eh has greater importance in the sense that when the Eh drops down below -150 mVolts hydrogen sulphide production takes place and if the hydrogen sulphide is allowed to get dissolved in to water H2S toxicity and consequent death will take place in the animals. Nature has its way of managing this eventuality by having a group of photosynthetic sulphur bacteria, which will grow at the pond bottom and absorb the emanating hydrogen sulphide and to oxidize it to Hydrogen ions and Sulphur. This hydrogen is used as the reducing power for fixation of carbon dioxide.  In all aquaculture systems the required quantity and type of photosynthetic sulphur bacteria may not be available. In such cases bioaugmentation happens to be required for establishing H2S oxidation. Rhodospeudomonas julia MCCB147 has been identified as bioaugmenor and used as the ingredient of the product ‘Hydrogensulphideoxidizer’ to be applied at the pond bottom through an applicator.