PHYTO PLANKTON BIO-DIVERSITY IN TIGER SHRIMP (Penaeus monodon) CULTURED POND UNDER NATURAL CONDITIONS AT BHEEMILI, VISAKHAPATNAM

In the worldwide aquaculture has become global economic activity. It has developed rapidly over the last three decades. In India the annual production of shrimp is approximately 0.126 million metric tons (MPEDA 2010). Phytoplankton are well known as an important source of supplement food, animal feed, bioactive compound, biofuel (Borowitzka 1999; Melis 2002; Shimizu 2003; Singh et al. 2005; Metzger & Largeau 2005) and also significant in bioremediation applications (Kalin et al. 2004; Munoz & Guieysse 2006) and nitrogen fixation (Vaishampayan et al. 2001). In shrimp ponds, phytoplankton were found growing naturally and their diversity and abundance often vary, depending on several environmental factors such as light, temperature, pH and salinity (Araújo & Garcia 2005; AlonsoRodriguez & Páez-Osuna 2003). Penaeus monodon used to be the major cultivated shrimp species in India, the qualitative and quantitative abundance of

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