Dear Asif sir,
I was in shrimp farming and fish farming for a period of 7 years. up to my knowledge, Tilapia fish is not Quality fish and mostly called as a weed fish in south india. Mostly, i think, it is one of the cheapest available in fishes.
Mostly it is used as a feed for crabs culture, sea boss fish culture etc, as they like to hunt and eat fish rather than dead ones. Fish Farmers generally affraid, if Few tilapia fishes enters in to a fish pond, as they will increase very rapidly and become beyond control.
My sincere suggestion is, think twice before venturing in to tilapia farming.
As a whole, fish farming is profitable and woth doing. Ofcourse, in North India , it is still more profitable.
With good wishes, g.p.rao, …farmer