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2. Habit, Habitat and Culture of Hydra:
Hydra is found in freshwater ponds, pools, lakes, streams and ditches.
It usually remains attached to submerged vegetation or with any solid object. When it is undisturbed, its body remains extended with tentacles spread out and shows expansions and contraction without any apparent reason. It is carnivorous in habit and feeds on small insects, insect larvae and small crustaceans. It lives singly, i.e., solitary in habit. It reproduces sexually as well as asexually.
Collection and Culture of Hydra:
Hydra can be collected from freshwater lakes, ponds, etc., usually during winter months. If we collect ajar of water with Hydrilla plants and put it undisturbed for a day or two; we may notice a number of Hydra attached either with the wall of glass jar or with the leaves of Hydrilla plant.
These may be examined under microscope by putting them on a glass slide with the help of dropper. For making its culture in laboratory, the same may be transferred in aquarium and a sufficient amount of food must be supplied daily. Its food generally consists of Daphnia readily available in stagnant water. By budding, their number increases very soon in the aquarium.