| Summary: | A 9 week study was conducted to evaluate the ability of juvenile turbot Scophthalmus maximus (initial body weight: 8.06 ± 0.08 g) to utilize carbohydrates of different molecular complexity (glucose, sucrose and dextrin) diets. Triplicate groups of fish were hand-fed each of the diets in a re-circulated water system. Results showed that weight gain rate and feed efficiency of fish fed dietary dextrin and the control diets were higher than those fed dietary glucose and sucrose diets (P<0.05). Fish fed dietary sucrose had significantly higher daily feed intake than those fed the other three diets (P<0.05). The apparent digestibility coefficients of carbohydrates were glucose > dextrin > sucrose with the lowest occurring in fish fed dietary sucrose. Lipid content in muscle and liver was significantly higher in fish fed the control diet, and muscle glycogen was significantly highest (P<0.05) in fish fed dietary glucose. The order of the liver glycogen was glucose > sucrose > dextrin > control. Insulin was significantly highest (P<0.05) in fish fed dietary dextrin plasma. In fish fed the control diet total cholesterol in plasma was highest (P<0.05), and triacylglycerols in plasma of fish fed the control and dietary dextrin diets were significantly highest (P<0.05). In conclusion, the present study suggests that turbot can utilize dextrin more efficiently than glucose and sucrose.
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