Influence of High Carbohydrate Low Protein Diet on Growth, Apparent Digestibility and Hepatopancreatic Enzyme Activities in Fingerlings of Red Sea Bream Pagrus major

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  • SUGITA Tsuyoshi
    Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency
  • YAMAMOTO Takeshi
    Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency
  • FURUITA Hirofumi
    Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency

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Other Title
  • 高糖質低タンパク質飼料がマダイ稚魚の成長, 見かけの消化率および肝膵臓の酵素活性に及ぼす影響

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Abstract

The influence of high carbohydrate low protein diets on growth, apparent digestibility and hepatopancreatic enzyme activities were investigated in red sea bream Pagrus major. Fingerlings of 11.4g average body weight were fed for 12 weeks on 2 experimental diets containing different carbohydrate (20 and 28%) and protein (44 and 38%) levels, and on a low carbohydrate (12%) high protein (52%) control diet. Weight gain (WG) of the medium carbohydrate diet (MCD) group was lower than that for the control diet (CTD) group, though protein efficiency ratio (PER) and protein retention of the MCD group were higher than those of the CTD group. Furthermore, WG, feed efficiency, specific growth rate and protein retention for the highest carbohydrate diet group was the lowest among the dietary groups. Hepatopancreatic fructose-1, 6-bisphosphatase, glucose-6-phosphate dehydrogenase and aspartate aminotransferase activities were not different between the dietary groups, and these indicate that the amino acid mobilization as a gluconeogenic substrate was not affected even though the high carbohydrate low protein diets were fed. These findings suggest that fingerling red sea bream cannot effectively utilize a high carbohydrate low protein diet, so that adding a large amount of carbohydrate to the diet cannot spare dietary protein without retarding the growth performance.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (2), 191-198, 2007

    Japanese Society for Aquaculture Science

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