Having done extensive research into aquaculture - the most profitable aquaculture operations are actually ones breeding and selling ornamental fish...
But if you want to farm fish for food sale then you need to look at fish that are the easiest to keep in tanks, ponds or sea cages and select a species with the most efficient FCR (Food Conversion Ratio) as well as the most popular in seafood markets.My studies were all around Cobia - who have an excellent FCR and fast growth rates and can adapt socially to intensive stocking - all grown in specially designed ocean cages.