Journal of Bioremediation & Biodegradation
Open Access

Abstract

The common species observed in the shrimp culture of Indian aqua farms is Penaeus monodon. Due to the different problems like non-availability of good quality post larvae, low export price and regular disease incidence, the alternative species for the shrimp culture was identified to be important in most of the culture areas. The very recent development in aquaculture practices of India is the production of the Litopenaeus vannamei with high stocking densities was observed. There are different stocking densities under practiced by different farmers and the range of stocking densities falls between 25 - 100 Pcs/sq.mt. The common stocking density followed by many farmers is about 35 - 50 Pcs/ sq.mt. At this increased stocking densities, there are different physical, chemical and biological changes observed in the pond dynamics which are caused by the changes in the plankton and also in the bacterial populations. The present study was undertaken to observe the changes in the bacterial dynamics and management of good water quality and healthy plankton, in the culture ponds of stocking density 50 Pcs/sq.mt uniformly in two experimental ponds and one control pond. This study was done during the first crop from Feb- July�10, to identify the changes in the bacterial dynamics of both pathogenic & non-pathogenic bacteria in the culture environment with difference in the frequency of application of probiotics for the ecosystem management of the experimental ponds and without probiotics in the control ponds at rate of seven day & fifteen day frequency. The commercial probiotic used in this study was Mera Bac W produced by M/S. Novus International, USA having a concentration of 4 Billion cfu-gm. Very interesting and significant results were observed during the study in the management of plankton, prevention of bacterial problems, observations of disease incidence and the growth of the shrimps. The results were tabulated and studied for further evaluation.

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