Seasonal variations in the density of a small West African lake Austin B. M. Egbore OriginalPaper Pages: 195 - 203
An evaluation of Secchi disk visibility for estimating plankton density in Fish ponds Guadiosa AlmazanClaude E. Boyd OriginalPaper Pages: 205 - 208
Distribution of certain species of utricularia in relation to their habitats in and around Jamshedpur, India U. N. JhaM. JhaMeena Kumari OriginalPaper Pages: 225 - 228
Changes in the aquatic flora along a stretch of the river UmeƤlven, N. Sweden, following hydro-electric exploitation Christer Nilsson OriginalPaper Pages: 229 - 236
Repartition spatio-temporelle, biomasse et production des populations zooplanctoniques du lac d'aydat en periode estivale Nicole Lair OriginalPaper Pages: 237 - 256
Determining fish avoidance of polluted water Stephan R. LarrickK. L. DicksonJohn Cairns Jr. OriginalPaper Pages: 257 - 265
Laboratory studies on the direct effect of temperature on the freshwater vector snail, Indoplanorbis exustus (Deshyes) D. P. VaidyaR. Nagabhushanam OriginalPaper Pages: 267 - 271
A note on the nutrition of Stylaria lacustris (Oligochaeta: Naididae) B. Streit OriginalPaper Pages: 273 - 276
The distribution of Achlya americana (Saprolegniales) in different aquatic habitat at Jabalpur, India S. K. HasijaS. Batra OriginalPaper Pages: 277 - 279