Commercial enzymes like bromelain were used in fermented silage production to accelerate the liquefaction process, and addition of bromelain (0.7–0.9%, w/w) and Lactobacillus plantarum to minced whole fish with 15% molasses increased the proteolysis rate and decreased the liquefaction time from 15 days to 12 h ( Tome et al., 1995). This process yields an aqueous solution and limits the growth of spoilage bacteria ( Arason, 1994). Liquefaction is caused by the action of enzymes naturally present in the fish and is accelerated by the acid, creating the right conditions for the enzymes that are active at low pH to hydrolyze quickly most of the protein. Oberoi, in Agro-Industrial Wastes as Feedstock for Enzyme Production, 2016 Seafood Enzymes in Feed Products Fish Silageįish silage is a liquid product made from whole fish (bycatch fish) or fish waste plus acid, or, less frequently, alkali. A third use for fish hydrolysate is as a component of growth media for industrial fermentation.Ī.U. Fish hydrolysate may be used as an ingredient in compound feeds much like fish silage. The product may be treated further, depending on how the product is to be used. Oils and the remaining solids are removed, leaving a hydrolysate. Water is added to the minced fish, and suspended solids are liquefied through the action of proteolytic enzymes. The production process for hydrolysates is similar to that of fish silage. Some of the water may be removed via evaporation. The product is stored for a period during which the fish is liquefied by digestive enzymes. During production, the fish is usually minced and mixed with materials that inhibit bacterial growth. Fish silage is used mainly in fish feeds and moist feed pellets. Smedbol, in Encyclopedia of Ocean Sciences, 2001 Fish Silage and Hydrolysatesįish silage is used as an ingredient in animal feed, and is treated separately from fish meal due mainly to differences in the production process.

Fish feed and grow fish