Shark fin rays
Shark fin ray is a valuable byproduct from the shark. The shark fins are dried, soaked overnight in 10% acetic acid solution. The skin and the softened muscle are scraped off and the rays are separated individually. They are then washed thoroughly and dried. Shark fin rays are an essential ingredient in some exotic soups.
Chitin and Chitosan
Chitin is the second most abundant biopolymer on earth next only to cellulose. It is a white, hard, inelastic nitrogenous polysaccharide extensively used for several purposes. In India, the single largest source of chitin is the shrimp shell and head waste. Chitin is produced from the shell waste by deproteinisation and demineralization. Chitosan is produced by the deacetylation of chitin. Chitosan has several industrial and medicinal uses.
Squalene is a highly unsaturated hydrocarbon present in the liver oil of certain species of deep sea sharks mainly Centrophorus and Squalidae spp. The liver oil of these species contain high percentage of squalene (90%) which can be isolated and purified and can be used as a dietary supplement.
Isinglass is prepared from fish maws (dried air bladder). Fish maws is soaked in water for 24 hours, washed and extruded, dried at 450 c and then powdered. It is mainly used for the clarification of wines.