TROPICAL AQUARIUM FISHES 63 
daphnia eggs woulc be carried away and consequently it would take longer 
in the spring to dev2lop a stock large enough for practical use. If possi- 
ble it is a good plan to have two or more daphnia ponds, so that one may be 
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replenished while the other is being drawn from. The bottom of daphnia 
pools should be prepared with a substantial layer of dead leaves and 
manure of any kind. Later in the season when this has all disintegrated, 
a new supply should be occasionally added. Any decomposing vegetal 
or animal substances will do. If a prowling cat has met accidental death 
by shooting, its carcass placed in the daphnia pond will give quite an im- 
