What is 'Blue revolution'? Name two fresh water and two marine edible fish?

Rearing of aquatic animals, like fish and prawn is called Blue revolution.It has brought a lot of income to the farmers in particular and the country in general.Blue revolution is being implemented along the same lines as ‘Green Revolution’.
Fisheries have an important place in Indian economy.They provide income and employment to million of fishermen and farmers.It is the only source of their livelihood.
Freshwater fish:Catla, Rohu and Common carp.
Marine fish:Hilsa, Sardines, Mackerel and Pomphrets.

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