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Journal of Experimental Biology 50,375-386 (1969)
Published by Company of Biologists 1969

The Nitrogen Balance in Plaice, Sole and Perch

L. BIRKETT ¹

¹ Fisheries Laboratory, Lowestoft

1. 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.

2. 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%.

3. The maintenance rate of absorption was between 0.173 and 0.499 mg. N/g./day.

4. The basal rate of excretion amounted to 0.056-0.208 mg. N/g./day.

5. 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.