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Fritzi Schlicker
Hydras, though very small, can be kept in aquariums if you feed them the small worms, water fleas and miniature, planktonic prey they need. Unlike saltwater corals and anemones taken from the wild and sold at pet stores, our freshwater hydras are numerous and free.
The genomes of cnidarians are usually less than 500 MB in size, as in the Hydra viridissima, which has a genome size of approximately 300 MB. In contrast, the genomes of brown hydras are approximately 1 GB in size. This is because the brown hydra genome is the result of an expansion event involving LINEs, a type of transposable elements, in particular, a single family of the CR1 class. This expansion is unique to this subgroup of the genus Hydra and is absent in the green hydra, which has a repeating landscape similar to other cnidarians. These genome characteristics make Hydra attractive for studies of transposon-driven speciations and genome expansions.[30]
Due to the simplicity of their life cycle when compared to other hydrozoans, hydras have lost many genes that correspond to cell types or metabolic pathways of which the ancestral function is still unknown.
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