Analysis ofnutritional components in back muscle of skipjacks

We evaluated the nutritional components in back muscles of three kinds of skipjacks (Katsuwonus pelamis, Sarda orientalis and Auxis thazard). The results showed that: 1) the crude protein contents of three kinds of skipjacks were 22.86%~24.65%, while crude fat contents were only 1.41%~2.51%. Minerals were abundant in their back muscles. 2) Seventeen kinds of fatty acids were detected in K.pelamis and S.orientalis, while 23 kinds in A.thazard. The ratios of PUFA/SFA were 1.17, 0.93 and 1.14, while the ratios of n-6/n-3PUFA were 0.07, 0.04 and 0.11, respectively. The content of poly-unsaturated fatty acids in back muscle of K.pelamis was 38.98%, higher than 33.64% of S.orientalis and 37.89% of A.thazard. 3) Essential amino acids content and essential amino acids index (EAAI) of S.orientalis were 35.10% and 0.90, respectively, higher than 33.95% and 0.89 of K.pelamis, and 32.51% and 0.89 of A.thazard.