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- W1992248108 abstract "Four extruded diets differing in protein/fat concentrations, 378/389 g kg−1, 425/346 g kg−1, 480/308 g kg−1 and 524/256 g kg−1 were tested in a digestibility trial and a growth study. Apparent digestibility of protein and fat were not significantly different among the diets when tested in 1-kg Atlantic salmon, Salmo salar L., in sea water. The diets represented a range of digestible protein to digestible energy ratios (DP/DE ratios) of 14.1, 16.4, 18.8 and 21.9 g MJ−1.The 138-day growth study was performed with triplicate groups of Atlantic salmon of 1.0 and 2.5 kg initial weight. Irrespective of size; growth, feed conversion ratio (FCR), nitrogen and energy retention were poorer in fish fed the diet with DP/DE ratio of 14.1 g MJ−1 compared with the fish fed the other diets. A DP/DE ratio of 16.4 g MJ−1 was sufficient to produce maximum growth for the large fish, while the DP/DE ratio of 18.8 g MJ−1 produced the highest growth in the small fish. In the large fish, the lowest FCR was obtained on a DP/DE ratio of 16.4 g MJ−1, while there was no clear difference in FCR within the small fish when diets of DP/DE ratios of 16.4–21.9 g MJ−1 were fed.The carcass-to-body ratio in the small fish decreased with decreasing DP/DE ratios. The fish fed the diet of 21.9 g MJ−1 had significantly lower fat and dry matter and higher protein content than fish of similar size fed the other diets. Increased dietary lipid content seemed to improve astaxanthin deposition in the small fish, while the large fish showed no significant differences in astaxanthin deposition due to dietary treatment.This study indicates that a DP/DE ratio of 14.1 g MJ−1 in high-energy diets for Atlantic salmon in sea water is below the optimal DP/DE ratio for growth and feed utilization, and that the optimal DP/DE ratio decreases with increasing fish weight. DP/DE ratios around 19 g MJ−1 for fish weighing 1 to 2.5 kg, and 16–17 g MJ−1 for fish weighing 2.5 to 5 kg, are suggested to be optimal." @default.
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- W1992248108 date "1997-06-01" @default.
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- W1992248108 title "Dietary protein/energy ratios for Atlantic salmon in relation to fish size: growth, feed utilization and slaughter quality" @default.
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- W1992248108 doi "https://doi.org/10.1046/j.1365-2095.1997.00084.x" @default.
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