1. Electricity generation and cooling water problems

   • K. J. Keller

   BriefCommunication Pages: 83 - 85

2. Investigation of hydrobiological effects due to cooling water discharges of electric power plants

   • F. B. J. Koops

   OriginalPaper Pages: 86 - 95

3. The etiology and epidemiology of botulism in waterfowl in The Netherlands

   • J. Haagsma

   OriginalPaper Pages: 96 - 105

4. Parameter dependant (temperature) tolerance levels and the influence of the complexity of the biological system

   • J. Ringelberg

   OriginalPaper Pages: 106 - 114

5. Environment and cooling water

   • J. Verwey

   OriginalPaper Pages: 115 - 120

6. Macrobenthos and fishes of the rivers Meuse and Rhine, The Netherlands

   • J. C. H. Peeters
   • W. J. Wolff

   OriginalPaper Pages: 121 - 127

7. Publications

   • Jaap Dorgelo

   BookReview Pages: 127 - 136

8. Miscellanea

   Announcement Pages: 136 - 139

9. The plankton of Richard Bay

   • J. R. Grindley
   • T. Woolridge

   Erratum Pages: 141 - 141