Common name: Salvinia
Botanical name: Salvinia molesta
Management programme: National Interest Pest Response led by Biosecurity New Zealand (a business unit of the Ministry of Primary Industries).

An infestation of the invasive aquatic weed salvinia (Salvinia molesta) was detected mid-March 2023 at the old Waihī Beach reservoir. Biosecurity New Zealand is working on this with Western Bay of Plenty District Council, Bay of Plenty Regional Council, AsureQuality, Ngāti Tara Tokanui and Te Whānau a Tauwhao.

About Salvinia

Salvinia is not native and can grow rapidly. It can form dense mats that cover entire water bodies, crowd out native plants, increase shade in the water and decrease oxygen levels in the water, affecting the water quality and submerged plants and animals.

Salvinia is a notifiable and unwanted organism under the Biosecurity Act 1993. This means it is illegal to gather or move salvinia.

Salvinia can be spread by water currents, by animals and by contaminated equipment such as kayaks.


You can read more information about salvinia on the Biosecurity New Zealand factsheet.

To report suspected salvinia in another location, please call Biosecurity New Zealand on 0800 80 99 66.