HEADY Role in Hydra Hydra, a multicellular, lower-eukaryotic, freshwater polyp, is known for its developmental idiosyncrasies. Slice off its head or its foot, and within two days either regenerates ...

1. Hydra: Dangers to Fry and Small Fish Hydras are among the most dangerous parasites that can affect freshwater aquariums. These organisms are soft-bodied polyps that, much like jellyfish ...