1. Congratulation to Prof. Heinz Ambühl's 65^th Anniversary

   • Hans Rudolf Bürgi

   EditorialNotes Pages: 157 - 160

2. Reaction of fish larvae to the water of the River Elbe at Hamburg harbour

   • Andreas Rieckhoff
   • Walter Nellen

   OriginalPaper Pages: 161 - 172

3. Field observations on the production of rainbow trout(Oncorhynchus mykiss) under high concentrations of water-borne iron

   • W. Steffens
   • Th. Mattheis
   • M. Riedel

   OriginalPaper Pages: 173 - 178

4. Nanociliates of the order Prostomatida: Their relevance in the microbial food web of a mesotrophic lake

   • Ruben Sommaruga
   • Roland Psenner

   OriginalPaper Pages: 179 - 187

5. Empirical relationships between diversity of invertebrate communities and altitude in rivers: Application to biomonitoring

   • Claude Lang
   • Olivier Reymond

   OriginalPaper Pages: 188 - 196

6. Diversity of meiofauna in the lacustrine profundal zone: Bathymetric differences and influence of environmental factors

   • Jukka Särkkä

   OriginalPaper Pages: 197 - 205

7. Bottom currents induced by baroclinic forcing in Lake Banyoles (Spain)

   • E. Roget
   • J. Colomer
   • J. E. Llebot

   OriginalPaper Pages: 206 - 227