The Goulburn Broken Catchment Management Authority (CMA) is calling on recreational users of Lake Benalla to help stem the spread of an invasive aquatic weed.
The invasive cabomba weed in Lake Benalla.
Cabomba is a fast-growing weed that can quickly dominate waterways, out-compete native plants, reduce water quality and impede recreational use.
Goulburn Broken CMA Environmental Water and Wetlands Officer, Jo Geddes, said the weed was back in the lake at Benalla, following an outbreak about five years ago.
“Community cooperation is essential in preventing the further spread of cabomba,” Ms Geddes said.
Anyone using Lake Benalla for recreational activities including canoeing, kayaking, paddleboarding or fishing is urged to thoroughly wash down all equipment after use and before leaving the lake to remove plant fragments from equipment.
“This includes from vessels, fishing gear, paddles, clothing and footwear.
“Even small fragments of cabomba can establish new infestations if transported to other waterways.”
Cabomba is an introduced plant that is often used in aquariums. It has fan-shaped, brownish ferny leaves that sit mostly underwater, with a white flower floating on the surface.
As well as smothering native aquatic vegetation that provides valuable habitat for native animals, fish and waterbugs, cabomba can clog pumps and filters.
Goulburn Broken CMA is now working with Benalla Rural City Council to assess the extent of the infestation and investigate the most effective management options.
“We are currently reviewing a range of control approaches and long‑term ecological strategies,” Ms Geddes said.
“Previous management strategies have included lake drawdowns and mechanical removal.
“We appreciate the community’s support in protecting the health of local waterways while we work with council to manage this infestation and minimise impacts.”
Further updates will be provided as planning progresses.