Volume 63, Issue 2
February 1966, pages 47-103
pp 47-52 February 1966
pp 53-56 February 1966
pp 57-66 February 1966
The significance of Liebig’s ‘Law of Minimum’ and Shelford’s ‘Law of Tolerance’ has been discussed. The environmental factors always act upon its inhabitants in a complex way.
From the field study it is difficult to single out a factor which could be responsible for the dominance of a given species or its complete absence.
Laboratory experiments have been conducted to study the reaction of different species of rotifers to thermal, pH and dissolved oxygen contents variations.
Platyias patulus has proved to be a true eurythermal species.Polyarthra multiappendiculata is very nearly the same. They can also withstand a wide variation in dissolved oxygen contents.
Present findings have been compared with those of other workers.
pp 67-79 February 1966
pp 80-95 February 1966
Experiments on large-scale production of fish seed of the chinese grass carp,Ctenopharyngodon idellus (C. and V.) and the silver carp,Hypophthalmichthys molitrix (C. and V.) by induced breeding in ponds in India
pp 96-103 February 1966
1. An account of the bottom fauna of the Tungabhadra reservoir is given with reference to their depthwise distribution and seasonal abundance.
2. From the studies, it was found thatPuntius kolus feeds extensively on the bottom fauna and there appears to be no competition for food among the fishes.