Daphnia Magna:
The most popular live food for aquarium fishes is Daphnia. Daphnia includes
several species, the largerst of which is D. magna. D. magna can
reach a size of 1/5 of an inch in diameter. Each pregnant Daphnia female
delivers up to fifteen babies (all are females under good conditions) every
three days (depends on food, temperature, and water condition). Daphnia are
heavy filter feeders and eat a wide variety of tiny organisms of appropriate size.
Daphnia can be used to clear the green water of aquariums and large outdoor
ponds without using dangerous chemicals. All Daphnia species produce large black
(resting) eggs under certain conditions. The resting eggs survive frost and
dryness. For fishes up to 4 inches.