On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

NIWA fish risk assessment model as applied to the 21 introduced species now present in New Zealand

Our fish risk assessment model as applied to the 21 introduced species now present in New Zealand (circles), and for 8 Northern hemisphere species that have been recently introduced to other countries, including Australia. The dashed lines indicate scores over which the risk is medium or high.