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Shark-fins are one of the most expensive fish products in the world that fetch high prices in the oriental market. The value of the fins depends on the species, size and quantity of fin needles. These factors are largely determined by the intrinsic chemical and physical characteristics of the shark-fins which this study addressed. ' In order to formulate the relationship between body size and fin sizes of sharks, seven hundered and sixty-six shark specimens were measured and recorded from landing sites in Oman between July, 1991 to June 1992. The regression of body size in relation to the fin sizes revealed different R2 within and among the different species of sharks. The best correlation was between the precaudal length and all four fins (dorsal, pectoral, tail and lower lobe of tail), especially in the spinner shark (R2=0.97). This will aid shark-fin vendors and purchasers to estimate sizes of the identified species to predict their values in the market. In the yield studies, the white fins gave a higher yield than the black fins. However, the lower lobe of tail from black varieties gave the heighest yield in fin needles, especially in the silky shark. Processing and

Physico-Chemical Characterization of Shark-Fins