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Effects of different fat sources on the growth and fatty acids composition of juvenile red tilapia

Chen Tao;Yang Yan;Lu Hang;Yao Jinjin;  
To research the effects of different fatsources on the growth and fatty acids composi-tion of juvenile red tilapia, we added 4% of lard,soybean oil, fish oil or soybean oil-fish oil mix-ture respectively in the basal diet, then the dietwas formulated into soft pellets and fed red tila-pia juveniles. There was no control group. Theresults showed that the average weight and the weight gain of fish in soy bean oil group and soybeanoil-fish oil group in the end of the experiment were significantly higher than group one(P0.05). TheFCR of lard group was significantly higher than that of other groups(P0.05) and the fatness was signif-icantly lower than that of the other groups(P0.05). The growth performance of fish in soybean oilgroup was the best. There was great relevance and a big difference existed between the fatty acid com-position in muscle of red tilapia juveniles and the one in feed, and the lard group exhibited the maxi-mum correlation. The relative content of SFA and MUFA in muscle of fish was higher than the contentof SFA and MUFA in feed. The relative content of C182n6, C183n3 and EPA in muscle of red tila-pia juveniles was lower than that of feed and DHA content in red tilapia was higher. The muscle of redtilapia juveniles in 2 and 3 groups was rich in C182n6 and C183n3, and the relative content ofC182n6 was in the range of 14.49%~21.75% and it was significantly higher than that in 1 and 4groups(P0.05). The muscle of red tilapia juveniles in 3 and 4 groups was rich in EPA and DHA. Thegrowth performance of fish in 2 and 3 groups was better than any other groups, and the value of n-3/n-6 was in the range of 0.19~0.74. The tests showed that the growth performance of fish in soybean-oilgroup was the best, and the muscle of red tilapia juveniles in 3 and 4 groups was rich in HUFA.
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