Products from industrial fisheries and byproducts from fish processing are overwhelmingly used for animal and fish feed. The wastewater – stick water – mainly represents a disposal problem.
Fish oil has found its way into the human food chain in the form of nutritional and health products. Membrane filtration can help to increase the volume of fish oil by capturing more oil.
Membrane filtration can also capture soluble proteins in stick water, a process which has been used to great advantage in other industries for decades. The soluble proteins in stick water are usually going to waste, although they can form 20% of all proteins in fish and other marine species. The soluble proteins can be cleaved to smaller peptides and utilized in food, beverage and health products with high nutritional value.
Among the beneficial characteristics are: • High nutritional value • Contains most amino acids • Antimicrobial characteristics • Hypertensive properties • Anticoagulant abilities
Membrane filtration can extract, concentrate, separate and fractionate the proteins in stick water to form many highly value added products in the fish processing industry.