The very predatory Hydra primarily feeds upon small invertebrates, such as Cyclops and Daphnia, that they pursue in the water.
Daphnia eat algae so they are herbivores.
As fast as they can.
Franklin Delano Roosevelt
A better question would be, what fish don't eat daphnia? Seriously though, I've never had a fish that didn't like it, the same with blood worms. They will eat it whether its freeze dried or live.
The hydras are gone.
there is not even hydras on clubpenguin
The hydra can produce asexually and sexually while the daphnia can only produce sexually. Also, the hydra is able to expand and eat other prey that is bigger than themself (ex-daphnia). The hydra is also able to send stinging cells to paralyze their prey so they cannot escape. The Daphnia can see while the hydra can only smell.
daphnia exretes nails and sweat
Daphnia feed on organic detritus (tiny bits of dead stuff), if you are keeping them I suggest feeding them algae (grow in separate tank!), yeast or grain. Remember it is best to underfeed than overfeed otherwise you may kill them all.
The scientific name for daphnia is Daphnia pulex. Daphnia are small, planktonic crustaceans commonly used in scientific research as a model organism due to their transparent bodies and ease of cultivation in the laboratory.
Daphnia pulex was created in 1758.