1. Beauchamp, R. S. A., J. Ecol., 41, 2, 226 (1953).
2. Harding, D., in Jackson, P. B. N., Harding, D., Fryer, G., and Iles, T. D., A Report on the Fish and Fisheries of Northern Lake Nyasa (Zomba) (in the press).
3. Joint Fish. Res. Org., Ann. Rep. No. 8, 1958 (1959).
4. Joint Fish. Res. Org., Ann. Rep. No. 9, 1959 (1960).
5. Joint Fish. Res. Org., Ann. Rep. No. 10, 1960 (in the press).