Analysis ofnutritional components in back muscle of skipjacks

Abstract

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-3∑PUFA 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.