Bacterial Flora of Cultured Rotifer Brachionus plicatilis
1988 Volume 35 Issue 4 Pages 237-243
Details
1988 Volume 35 Issue 4 Pages 237-243
The aerobic bacterial populations and flora of cultured rotifer (Brachionus plicatilis) and its ambient water were investigated at Hiroshima Prefectural Fish Farming Center from October to November in 1985.
In an outdoor tank (150m3) for rotifer culture, the numbers of bacteria in rotifers were 107-108CFU/g on ZoBell's 2216e agar, 106-107CFU/g on BTB teepol agar and those of the tank water were 105-106, 103-104CFU/ml, respectively. In an indoor tank (4m3, heated), almost the same numbers of bacteria as in the outdoor tank were detected both in rotifers and water.
The numbers of bacteria of rotifers were decreased to one tenth or one hundredth by a bathing in sodium-nifurstyrenate (10ppm, 1h) which was made after harvesting. In another experiment, rotifers were medicated before inoculation and after harvest, but the final bacterial population could not be lessened further.
Changes in bacterial flora of rotifers were investigated throughout the course of a culture. As the result, generic composition was found to be relatively stable, Pseudomonas (61.7%) and Moraxella (17.4%) being the dominant groups.
