1. The estimation of secondary production in a natural population of Daphnia hyalina (Leydig) using alternative methods of computation

   • T. E. Andrew

   OriginalPaper Pages: 3 - 18

2. Effects of pentachlorophenol (Na PCP) on survival, activity and metabolism in Rhinomugil corsula (Hamilton), Cyprinus carpio (Linnaeus) and Tilapia mossambica (Peters)

   • Mohamed M. Peer
   • J. Nirmala
   • M. N. Kutty

   OriginalPaper Pages: 19 - 24

3. Coal mine drainage effects on a lotic ecosystem in Northwest Colorado, U.S.A.

   • James W. Chadwick
   • Steven P. Canton

   OriginalPaper Pages: 25 - 33

4. Individual culture and experimental population dynamics of Keratella cochlearis (Rotatoria)

   • Norbert Walz

   OriginalPaper Pages: 35 - 45

5. A method for the laboratory culture of the planktonic rotifer Keratella cochlearis (Gosse)

   • James E. Vancil

   OriginalPaper Pages: 47 - 50

6. Carbon dioxide assimilation from air and water by duckweed Spirodela polyrrhiza (L.) Schleid

   • K. Satake
   • S. Shimura

   OriginalPaper Pages: 51 - 55

7. Errors in pH measurement with colorimetric indicators in low alkalinity waters

   • Terry A. Haines
   • John J. Akielaszek
   • Ronald B. Davis

   OriginalPaper Pages: 57 - 61

8. Redescription of Scapholeberis echinulata Sars 1903 (Crustacea, Cladocera)

   • Igor Hudec

   OriginalPaper Pages: 63 - 69

9. A new species of Erethistes Müller & Troschel from Thailand and Burma (Osteichthyes: Siluriformes: Sisoridae)

   • Maurice Kottelat

   OriginalPaper Pages: 71 - 74

10. La transparence et la charge sestonique de l'Étang de Berre (côte méditerranéenne française)

    • Ki-Tai Kim
    • Marc Travers

    OriginalPaper Pages: 75 - 95