Abstract:The dried swim bladders of fish also called as fish maw，is rank in the list of four sea treasures in Chinese cuisine.There are many species of swim bladders on the market，but few researches study on the differences in the material basis of swim bladders.In this study，several representative species were selected from traditional food material，Perciformes swim bladders and widely approbated new food material，Gadiformes swim bladders as samples to compare the differences in nutrition.The results indicated that both maws were high protein sources and low in fat content.The dominant amino acids in both maws were glycine，glutamic，alanine，proline，arginine，and hydroxyproline.These amino acids constituted 73.81%，70.04%，70.22%，67.15%，66.50%，65.50%，62.63%of the total amino acids in sea catfish′s maw，grouper catfish maw，yellow croaker maw，grouper maw，new zealand cod maw，iceland codmaw and red fish maw，respectively.The ratio of FAA and TAA （functional amino acids：total amino acids）in both maws were about 0.70.The contents of zinc and selenium in different species were quite different.The zinc content of red fish maw was lower than the detection limit，while yellow croaker maw was as high as 4.56 mg/100g.The selenium content ranges from 19.00 μg/100 g to 77.00 μg/100 g.