Preparation, Composition and Properties of Fish Silage Produced with Post-coagulation Sludge

The world fisheries and aquaculture supplied about 142 million tons of fish in 2008, of which 115 million tons was used as human food, providing around 17 kg (live weight equivalent) per capita/per person. Aquaculture accounted for 46% of total food fish supply, a slightly lower proportion with respect to that reported in the past. Huge amount of fish and other marine organisms were eliminated as under-utilized species which in most cases were returned into water (FAO, 2010). Total global by -catch is difficult to quantify because of incomplete information and because of the fact that various states define it differently. Nevertheless, the latest published estimate of global discards from fishing is of about 7 million tons [1]. The constant development of the fish industry generates a large quantity of waste, which means that not only considerable quantities of good quality protein are discarded annually but also environmental pollution is increased. Considering 45% of the live weight to be the waste, it can be estimated that nearly 63.6 million tons of waste is generated globally [1]. The major non-edible by-products arising out of fish processing include viscera, skin, scales and bones. In many countries, the fishery sector is unorganized and has problem of disposing fish waste generated as a consequence of