1. Editorial

   EditorialNotes Pages: 3 - 3

2. Chemical and physical effects on the shape and growth of the diatomBiddulphia sinensis Greville in batch cultures: A contribution to bioindication in plankton ecology

   • J. Jahnke
   • M. Baumann

   OriginalPaper Pages: 5 - 20

3. Algal nutrient competition in continuous culture

   • Ulrich Sommer

   OriginalPaper Pages: 21 - 27

4. The measurement of primary production: Problems and recommendations

   • F. Colijn
   • W. W. C. Gieskes
   • W. Zevenboom

   OriginalPaper Pages: 29 - 51

5. Preservation and storage of samples for the determination of dissolved organic carbon

   • A. G. A. Merks
   • A. G. Vlasblom

   OriginalPaper Pages: 53 - 58

6. Fish ecological studies in Tjeukemeer and fishery management

   • W. L. T. van Densen

   OriginalPaper Pages: 59 - 65

7. Developments in fishery management in The Netherlands

   • B. Steinmetz

   OriginalPaper Pages: 67 - 69

8. Biological assessment — The fairy-tale of the magic salve

   • P. J. Schroevers

   OriginalPaper Pages: 71 - 75

9. Aquatic ecology in The Netherlands: What is being done by whom?

   • Jacqueline Cramer
   • Rob Hagendijk

   OriginalPaper Pages: 77 - 85

10. Ecotoxicity tests with microorganisms

    • J. Blok

    Report Pages: 87 - 87

11. Applications of quantitative structure-activity relationships in aquatic toxicity studies of chemicals and mixtures of chemicals

    • Joop Hermens

    BriefCommunication Pages: 87 - 88

12. On the dynamics of chemically stressed populations: The deduction of population consequences from effects on individuals

    • S. A. L. M. Kooijman
    • J. A. J. Metz

    Report Pages: 88 - 89

13. Micro-ecosystems and toxicants: A search for effects on the ecosystem level of organisation

    • Kees Kersting

    Report Pages: 89 - 89

14. Publications

    • Jaap Dorgelo
    • Harry H. Tolkamp

    BookReview Pages: 91 - 93