1. Reproductive cycle of vendace (Coregonus albula L.) in relation to some chemical and biochemical changes in the body

   • Konrad R. Dabrowski

   OriginalPaper Pages: 3 - 15

2. Description of Barbronia assiuti n.sp. (Hirudinea) from Assiut, Egypt

   • M. A. Hussein
   • N. El-Shimy

   OriginalPaper Pages: 17 - 24

3. Identification of instars and species in some larval Polypedilum (Polypedilum) (Diptera: Chironomidae)

   • Annelle R. Soponis
   • Constance L. Russell

   OriginalPaper Pages: 25 - 32

4. The drift of zooplankton and microzoobenthos in the river Strandaelva, western Norway

   • Odd Terje Sandlund

   OriginalPaper Pages: 33 - 48

5. The Cladocera of Sri Lanka (Ceylon), with remarks on some species

   • R. Rajapaksa
   • C. H. Fernando

   OriginalPaper Pages: 49 - 69

6. Depth integrating samplers for use in limnocorrals

   • K. R. Solomon
   • K. Smith
   • G. L. Stephenson

   OriginalPaper Pages: 71 - 75

7. A laboratory method for studying zooplankton swimming behaviors

   • Claire Buchanan
   • Bernard Goldberg
   • Robert McCartney

   OriginalPaper Pages: 77 - 89

8. Dry weight loss and colonization of plant litter by macroinvertebrates: plant species and lake types compared

   • Kjell Danell
   • Åke Andersson

   OriginalPaper Pages: 91 - 96

9. Vertical nutrient and phytoplankton distribution in relation to physical stability

   • Michael Karydis
   • Nikoletta Moschopoulou

   Notes Section Pages: 97 - 101

10. Book reviews

    • E. Coppejans
    • H. Dumont
    • Koen Martens

    BookReview Pages: 103 - 104