ABSTRACT
Plaice, sole and perch were fed on live food for 20−40 days, and their growth rates were compared with their rates of absorption, both measured as mg. N/g. live weight/day.
The gross efficiency of nitrogen conversion—that is, the growth per unit of nitrogen absorbed in excess of maintenance—was between 27·5% and 49·0%
The maintenance rate of absorption was between 0·173 and 0·499 mg-N/g./day.
The basal rate of excretion amounted to 0·056−0·208 mg. N/g./day.
At maintenance, total excretion is equal to the amount of nitrogen absorbed from the food. The metabolic cost of growth was 1·04−2·64 mg. N excreted per mg. N retained.
Copyright © 1969 The Company of Biologists Ltd.
1969
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