1. Contents

   Legacy Pages: iii - iii

2. Index autorum

   Legacy Pages: iv - iv

3. Révision du genre Euplotes, fondée sur la comparaison des structures superficielles

   • Michel Tuffrau

   ReviewPaper Pages: 1 - 77

4. Contribution to the comparative physiology and genetics of the european salmonidae

   • J. T. Spaas

   OriginalPaper Pages: 78 - 88

5. Ecological studies on Olifantsvlei, near Johannesburg

   • A. D. Harrison
   • P. Keller
   • D. Dimovič

   OriginalPaper Pages: 89 - 134

6. Laboratory experiments on the growth of Tilapia spp.

   OriginalPaper Pages: 135 - 160

7. The comparative activity of some digestive enzymes in the alimentary canal of Tilapia and perch

   • G. R. Fish

   OriginalPaper Pages: 161 - 178

8. The Ephemeroptera, Plecoptera and Trichoptera caught by emergence traps in two streams during 1958

   • T. Gledhill

   OriginalPaper Pages: 179 - 188

9. Bibliography

   Legacy Pages: 189 - 192