Some of observations of the population growth mechanism in early stage of the rotifer Brachionus plicatilis culture
2007
Saito, T.(Tokai Univ., Shizuoka (Japan). School of Marine Science and Technology) | Oomori, F. | Watabe, S.
Population growth pattern of the rotifer Brachionus plicatilis was studied by evaluating the lag phase in three samples with varying density (0.6, 3 and 6 ind /ml) and each containing 5 ml of culture medium. The cultures showed a shorter lag phase in the samples with higher density. This result suggests that the physiology and metabolic activity of the rotifers were influenced by the density of the samples. Influence of output products (egestion and excretion) of rotifers on population growth was further examined under the present investigation. For this purpose, rotifers were cultured in filtered medium of different concentrations (25%, 50%, 75% and 100%) along with a standard (0% filtered medium). After a fixed time lag, it was noticed that the number of rotifers in the filtered medium was significantly higher (p0.05) than that of the standard. Such result clearly indicates inducing effect of the output product on the exponential growth phase of the rotifer population.
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