Hydras breed asexually and sexually. Asexual reproduction consists of budding (3). Around the middle of the hydra’s body there is a so-called budding belt. Here from time to time a tubercle (kidney) is formed, which grows and forms on the top a new mouth and the beginnings of tentacles. The kidney at the base is laced up, falls to the bottom and goes on to independent life. Sometimes budding is so vigorous that even before the first kidney is torn off, two or three others have time to form on the hydra.
Sexually, the hydra begins to multiply with the approach of cold weather. Hydras are dioecious, but hermaphroditic species are also found, and their reproductive cells come from the ectoderm, which is characteristic of all Hydrozoa. The eggs are located closer to the base of the hydra, and tubercles with sperm (male gonads) – to the mouth pole. The egg is fertilized in the mother’s body in the fall and is surrounded by a dense shell, then the hydra dies, and the eggs remain at rest until spring, when new hydras develop from them.
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