Aquatic ecosystems provide far diverse habitat and the inhabiting biota but our
interest in them is too recent and hence knowledge about them is extremely
small. The aquatic systems harbour organisms varying from small microbes to
largest mammals on globe, the blue whale. With this kind of biodiversity living
in aquatics, very little attention was paid till recently when man realized that
land is becoming a linking factor and produce from agriculture may not suffice
to meet the needs of society. The so made realization gave birth to aquaculture,
���?the culture of aquatic organisms under controlled conditions���?. Hence
fish (fin fish) along with some other organisms (animal