Gelatin is a partially denatured product of collagen that is found mainly in the skin, bone and connective tissue of animals. Gelatin is widely used in food, medicine, cosmetics and other industries due to its good biocompatibility, easy degradation and weak antigenicity. Gelatin is mainly used as a thickener, a foaming agent and a stabilizer in foods such as candy boxes and desserts. The demand for gelatin in the world is huge and it is increasing year by year. The edible gelatin produced in China is mainly derived from the skin and bones of mammalian cattle and pigs, but in recent years , the outbreak of mad cow disease ( BSE ) and foot and mouth disease ( FMD ), as well as religious beliefs and vegan opposition have caused people to Concerns about gelatin, domestic and foreign research scholars expect to use aquatic sources of gelatin instead of mammalian gelatin. 
