Preventing further introduction and spread of aquatic weeds through the ornamental plant trade

摘要

The trading of aquatic plant species for aquarium and pond plant purposes poses an ongoing risk of both future introductions and spread of aquatic weeds in Australia. Over 400 species of freshwater aquatic plants have been legally traded in Australiaover the last 30 years. Some of these have been known weeds whilst little was known about the weed potential of others. To address this concern the National Aquatic Weeds Management Group, in partnership with state governments, aquatic plant trade industries and New Zealand's National Institute of Water and Atmospheric Research, initiated a Weed Risk Assessment (WRA) of aquatic plants within the ornamental plant trade. Using a WRA model tailored to aquatic plants the process has to date identified 25 high-risk aquatic plant species for recommended national bans. Twenty one other species with significant weed potential were identified but require further data to conduct an accurate evaluation. The process ensures declarations will be based on research conducted under Australian conditions and made in consultation with industry.