However, about 40% of the fish is discarded as waste and over 20 million tons of fish wastes including liver, heads, intestine, backbones and skin are discarded into the environment around the world, resulting in pollution or a difficult waste disposal problem, and the loss of valuable nutrients (Enascuta et al., One scenario to ameliorate the challenge of feed supply is utilising more fish processing waste in the production of fishmeal and fish oil (World Bank, 2013). Already, for example, 90% of the ingredients used in fishmeal produced in Japan come from fish waste.