Growth and Flesh Quality of Cobia Fed with Increased Lipid and Reduced Protein Diet and Increased Carbohydrate and Reduced Lipid Diet

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Pichet Plaipetch
Kamonrat Yongjarean


Growth and flesh quality of cobia fed with increased lipid and reduced protein diets and increased carbohydrate and reduced lipid diets were determined. Test diets 1-4 contained protein/lipid/carbohydrate ratios of 40%/6%/31% (control), 36%/10%/33%, 36%/6%/36% and 36%/4%/38%, respectively. Groups of fish with an initial weight of 35 g were stocked in 3x3x2.5 M cage in Sri Racha Bay, Chonburi province, with stocking densities of 25 fish per cage and fed each diet to satiation once a day for 6 months. The results showed that the growth and feed conversion ratio of fish fed diet 1 were significantly better than those of fish fed diets 3 and 4 (p<0.05), but not significantly different from those of fish fed diet 2 (p>0.05). The protein efficiency ratio and flesh protein retention of fish fed diet 2 were significantly better than those fish fed other diets (p<0.05). There were no significant differences in condition factor, percentages of flesh and other organs, hepatosomatic and viscerosomatic indices among fish fed all test diets (p>0.05). The flesh protein contents of fish fed diets 1, 2 and 4 were not significantly different (p>0.05), but significantly higher than those of fish fed diet 3 (p<0.05). The flesh lipid contents of fish fed diets 1 and 3 were not significantly different (p>0.05), but significantly higher than those of fish fed diets 2 and 4 (p<0.05). From this study, it was observed that the cobia diet for 35-800 g could reduce protein from 40% to 36% calculated as a reducing rate of 10%, and increase lipid from 6 to 10%, calculated as an increase rate of 66.7%.

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Biological Sciences


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