Diel periodicity in the plankton, drift and benthos in an unregulated Tropical River Pages 

1 - 16

S. V. KRISHNAMURTHY & S. RAVICHANDRA REDDY (India).

Some aspects of the reproduction of female corvine fish Plagioscion squamosissimus Heckel, 1840 (Scienidae) in a reservoir of southern Brazil Pages 

17- 26

P. GODINHO, GILMAR B. SANTOS, EDNEA C. ASSIS (Brazil).

Brachionus species of some inland waters in Nigeria with a note on a new record and Zoogeography Pages 

27- 39

S. I. OVIE (Nigeria).

Cage culturability of some commercially important fish species in lake Kainji, Nigeria

SAMUEL OLU, OTUBUSIN (Nigeria). Pages 

41 - 47

The composition, distribution and seasonal variation of Crustacea in Jamieson River, south-west Nigeria Pages 

49 - 63

TUNDE O. T. IMOOBE & AUSTIN B. M. EGBORGE (Nigeria).

Response of Nitrobacter to toxicity of oilfield dispersants and domestic Detergents Pages 

65 - 74

GIDEON C. OKPOKWASILI & LUCKY O. ODOKUMA (Nigeria).

Some aspects of the ecology of Characidae (Pisces) in river Ase, southern Nigeria Pages 

75 - 87

GEORGE IDODO-UMEH, ANTHONY E. OGBEIBU (Nigeria) & REGINALD VICTOR (Oman).

Papers already published Pages 

89 - 92