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Hydrilla is a submerged aquatic herb native to the Northern Territory, Queensland and New South Wales where it grows in relatively calm freshwater streams and lakes, especially in warmer areas. It can be distinguished from similar submerged exotic species, such as the aquarium escapees Egeria densa and Elodea canadensis, by its distinctive serrated leaf margins.

Hydrilla forms an important component of the freshwater food chain for a range of small invertebrates which are a food source for larger animals including fish and birds. Its foliage also provides shelter for fish and tadpoles. In Australia, this species usually grows as part of a balanced community and can help to improve water quality and fish production (Sainty and Jacobs, 2003).

Sainty G.R. and. Jacobs S.W.L., 2003. Waterplants in Australia. Sainty and Associates Pty Ltd, Australia.

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