The water phase in the fishmeal process, after the solids and oil phase have been separated. The main components of stickwater are water soluble proteins, peptides, amino acids, and salts. Stickwater is typically concentrated on an evaporator before being blended with presskake and dried to produce fishmeal

Enzymatic hydrolysis is a method commonly used to extract proteins from fish side stream products. The main purpose of a hydrolysis process is to degrade proteins, by action of enzymes, and solubilizing them in water, increase protein recovery and the yield of valuable components. The hydrolysis process will yield a water-phase (the protein hydrolysate), a sludge phase and oil phase, if based on a fatty raw material. The fish protein hydrolysate can be dried to a protein powder that is applicable within a variety of products.

Fish silage is a liquid product made from whole fish or fish side streams that are hydrolyzed by endogenous enzymes in the presence of an added acid, usually formic acid. At acidic pH, the digestive enzymes break down the fish proteins into smaller peptides and free amino acids. The process is inexpensive and does not require high investment-costs and is regarded as especially useful when only small amounts of fishery side streams are available.

The approximate minimum molecular mass of molecules retained by a filtration membrane. In nanofiltration, the MWCO only applies to neutral or monovalent molecules, as divalent cations are more than 95% retained regardless of molecular mass.

A form of evaporation in which molecules pass directly from the solid phase to the gas phase, without going through a liquid phase. For water to sublime, the pressure must be below 6 mbar and the temperature must be below 0 ℃.

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