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In this study, 16 samples including 8 head samples and visceral samples of tuna species in central Vietnam coast are collected and serveyed the composition and content of fatty acids in the total lipid. The obtained results show that the total lipid content in the head samples range from 4.5 % to 11.7 % weight of fresh samples, particularly, the total lipid content of MT1 (head of Thunnusobesus) and VV1 (head of Thunnusalbacares) reached 14.2 % and 14.8 %. In visceral samples, the total lipid content ranges from 2.3 % to 6.5 % compared with the weight of fresh sample. We also identified 37 kinds of fatty acids, in which head samples of tuna are rich in fatty acids in the omega-3 group (from 24.7 % to 37.8 %). Especially DHA ranges from 19.3 % to 27.8 % and EPA ranges from 4.4 % to 8.4 %. Analysis results showed that omega-3 content in visceral samples less than head samples of tuna, their contents only reach from 16.0 % to 31.4. The fatty acids content in the omega-6 group are the lowest and reach from 4.7 % to 10.8 %. Keywwords:tuna, total lipit, fatty acids, DHA, EPA.

SURVEY ON TOTAL LIPID CONTENT AND COMPOSITION OFFATTY ACIDS FROM HEAD AND VISCERA OF TUNA