Effects of sodium nifurstyrenate bath and freezing of live diets on the growth, survival, and bacterial intestinal flora of black seabream (Acanthopagrus schlegeli) larvae.
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The effects of sodium nifurstyrenate (NS) bath and freezing of rotifers (<I>Brachionus plicatilis</I>) and brine shrimp (<I>Artemia salina</I>) on the growth, survival rate, and the aerobic bacterial intestinal flora of black seabream larvae were investigated at a fish farming station. Bacterial counts (ZoBell's 2216e) of black seabream larvae (Pond I) fed with medicated live diets and artificial diet were 1.7×10<SUP>2</SUP> and 3.9×10<SUP>3</SUP>CFU/fish in 10 and 15-day-old fish, respectively. Those of the fish (Pond II) fed with frozen rotifers and brine shrimp nauplii were 2.2×10<SUP>2</SUP>and 1.9×10<SUP>3</SUP>CFU/fish at each stages. In the case of the fish (Pond III) given live diets without NS treatment and artificial diet, bacterial counts were 3.6×10<SUP>2</SUP> and 2.4×10<SUP>3</SUP>CFU/fish in 10 and 15-day-old fish, respectively. The differences in bacterial count among them were small at these stages. But in 42-day-old, bacterial counts of larvae of Pond I, II, and III reached 1.3×10<SUP>3</SUP>, 5.3×10<SUP>2</SUP>, and 3.6×10<SUP>6</SUP>CFU fish, respectively. Although <I>Vibrio</I> (38.9-72.7%) and <I>Pseudomonas</I> (20.7-52.4%) constituted dominant bacteria in either fish groups, the conspicuous changes of the most dominant bacteria were observed in the fish of Pond III. The average total length of the fish (46-day-old) at the end of the experiment were 16.5, 14.0, and 17.6mm in Pond I, II, and III, respectively. And survival rates were 40.6, 73, 1, and 25.9%, respectively. There were no differences in the suffocation tolerance (handling test) among them. From these results, frozen rotifers and brine shrimp nauplii seem to be superior as diets for black seabream larvae.
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