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

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Native plants of milfoil and pondweed on a muka mat after approximately six weeks. Lead weights were used to hold the mat in place on plastic trays during this small-scale tank trial.
NIWA

Native plants of milfoil and pondweed on a muka mat after approximately six weeks. Lead weights were used to hold the mat in place on plastic trays during this small-scale tank trial.