The exploitation of marine by-products as a new source of collagen has attracted increasing
attention due to their easy extraction, high collagen content, absorption by the human body
considering its low molecular weight, biocompatibility, freedom from the risks of animal diseases and pathogens, environmental friendliness, negligible content in biological contaminants and toxins, less significant religious and ethical constraints, and minor regulatory and quality control problems.
Fish collagen is extracted from skins of different fish, such as small-spotted catshark rabbitfish, lantern shark, catshark, cuckoo ray, common Atlantic grenadier, cod and the scales and fins of Catla catla and Cirrhinus mrigala.