Comparison of flesh quality of farmed fugu,Takifugu rubripes from different culture models

The differences of muscle in nutritional components,delicious materials and physical characteristics of farmed fugu, Takifugu rubripes from Dalian,Hebei and Dandong,were tested and analyzed in order to evaluate its nutritive value and flesh quality.The three groups represented three culture models.The results showed that the content of crude protein was about 85% of dry matter and the content of crude fat was lower than 2% dry matter.There were no significant differences in the contents of moisture and crude protein,crude lipid among the three series fugu.18 common amino acids were found in the flesh,and amount of which was 15.75% of wet matter or 79.13%-83.19% of dry matter.The content of essential amino acids and nonessential amino acids was 32.77%-33.68% and 39.06%-41.72%,respectively.Glutamic acid was the most one in all amino acids,and its content was up to 12%.The delicious amino acids including Glu,Gly,Ala and Asp in Dandong group were up to 32.09%,higher than those of Dalian group(29.94%)and Hebei group(29.90%)significantly(P<0.05).There were also differences in some fatty acids,such as C16∶0,C20∶1ω9,C22∶6ω3,and total saturated fatty acids(SFA).The results of nucleotide and its metabolites indicated that hypoxanthine nucleotide(IMP)was the highest metabolite of nucleotide,whose content was up to 220.75-265.03 mg/L,being 10-100 times as much as the others.The K value of HB group(6.36)was lower than DD(10.65)and DL(12.06),suggesting that it had a longer shelf life than DD and DL groups.The results of texture using texture analyzer SMS TA XT plus indicated that there was no difference except the hardness and chewiness of muscle among the three models.The hardness of HB and DD was higher than that of DL significantly(P<0.05).In conclusion,the pattern of amino acids,the high content of essential amino acids(EAA)and poly-unsaturated fatty acids(PUFA)and DHA indicated that fugu flesh was nutritional and healthy to human,and was a good species for development.Different culture model influenced the flesh quality,and the combination of pond culture and net cage culture in sea was a good model.