Abstract
The rotifer Brachionus calyciflorus Pallas was grown in turbidostat culture, where the population (a clone) was forced to grow at its maximum specific growth rate ( μ max) for a 14-month period. During this period, the μ max increased 51% from 0.053/h (doubling time=13.1 h) to 0.080/h (d.t.=8.7 h) after 8 months, the highest growth rate yet reported for a metazoan. The ability to grow rapidly was not lost when the rotifers were maintained at a low growth rate for 5 months (50 culture generations), indicating the elevated μ max was due to a change in genetic composition or expression. Our procedure for increasing a population's μ max should be applicable to other rotifer and metazoan species, and be instrumental in increasing mass production of rotifers for aquacultural purposes.
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