Effect of Dietary Moisture Level on the Growth and Feed Performances of Fingerling Japanese Flounder.

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Three feeding experiments were conducted to clarify the suitable moisture level in the diets for three size-classes of fingerling Japanese flounder <I>Paralichthys olivaceus</I>. Experimental diets were prepared to have the same nutrient content on a dry weight basis but different levels (10 to 30%) of dietary moisture. These pelleted diets were fed to satiation to small fish (initial mean weight of 5.6g) and medium fish (15.4g) for 4 weeks at 20°C, and to large fish (57.5g) for 8 weeks at 17-24°C.<BR>Daily feed consumptions of each size of fish on a dry weight basis were not affected by the dietary moisture levels. Feed efficiency of the small fish fed a diet with 20% moisture was significantly higher than that of the fish fed a diet with 10% moisture. In the medium fish, dietary moisture level had no influence on the weight gain and feed efficiency. On the other hand, weight gain and feed efficiency were better in the large fish fed a 10%-moisture diet than those of the fish fed a 30%-moisture diet.<BR>These results suggest that suitable moisture level in the diets for fingerling Japanese flounder change with fish size. Adequate level of moisture content is 20% in diets for small fish, whereas more than 10% moisture would not be required for medium and large fish.
日本水産増殖学会の論文