Fishmeal and fish oil are one of the prime constituents of feed for commercial aquaculture: approximately 79,000 tonnes fishmeal and 15,800 tonnes fish oil were used for production of tilapia feed in 2003, which implicates that for tilapia production the pelagic input per unit of output is around 0.23-0.28(Naylor et al., 2000; FAO, 2006).