Aquatic Weeds: Submerged


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Cabomba - also known as Fanwort (Cabomba caroliniana) Infestations of Cabomba are rare at this time. It has the potential to become a serious weed of wetlands, waterways and streams unless action is taken now to reduce the number of infestations. Believed to have been introduced for the aquarium trade, it has been released into water bodies at a few sites in NSW. Cabomba will grow in water from 50cm to over a metre in depth. It forms a large thick tangled mass under the water that effectively crowds out native species. The native range of Cabomba is still unknown; it would be of assistance if suspected infestations are reported to NSW Agriculture or your Local Weeds Officer. Cambomba is a Category W4g Noxious weed under the Noxious Weeds Act 1993. Similar species Could be mistaken for Elodea, Parrots Feather or Hornwort. Distribution Very limited at this time, only one infestation recorded in the Great Lakes region. Control measures Apart from limited results by mechanical control, no other methods are presently available. Top of Page

Elodea (Elodea canadensis) Elodea is an introduced plant widely used in aquaria. It is listed as a Weed of Regional Significance, and is restricted in other states of Australia. Like most aquatic weeds, high nutrient loads in the water will result in vigorous growth. Plants will block inlet pipes, and make swimming and fishing difficult. Distribution Common in many rivers and streams in the region. Control measures Physical control: Of limited use as plants can regenerate from fragments and ongoing work will be required. Herbicide control: No registered products. Biological control: No known agents available. Top of Page

Hornwort (Ceratophyllum demersum) A native plant that can be found in rivers, creeks, lagoons, drainage channels, and farm dams throughout the region. It is a food source for waterfowl, and provides shelter for small fish and other aquatic organisms. This plant does not normally cause problems unless it is growing in water with a high nutrient level. Under these conditions it will form dense mats that restrict fishing, boating and swimming. Similar species Can be confused with Cabomba and Parrots Feather. Distribution Widespread through out the Hunter and Central Coast region. Control measures Physical control: Only a short-term solution, as plants will quickly regenerate, lowering the water level can reduce infestations. Herbicide control: Not recommended. Biological control: No known agents. Top of Page

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Version #2, 2004

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