Freshwater and Estuaries

We provide public information on catchment, river, lake and estuary conditions across New Zealand including water quantity, quality and ecosystem health.

Freshwater and Estuaries

Robust science is critical in the sustainable management of our precious freshwater resources and estuarine environments.

The National Centre for Freshwater and Estuaries provides public information on river, lake, and groundwater conditions across New Zealand including water quantity and quality. It also acts as a distribution point for new technology and management tools for water-related issues.

Scientists hoping to solve great eel mystery

NIWA freshwater scientists are pinning their hopes of solving an age-old mystery on 10 female longfin eels who are about to begin an epic journey to their spawning grounds somewhere in the Pacific Ocean.

Protecting freshwater taonga

Taonga species such as tuna (freshwater eels), kōura (freshwater crayfish) and kākahi (freshwater mussels) are central to the identity and wellbeing of many Māori.
Understanding and predicting the sources of contaminants, developing technologies to clean up the sources, and understanding the consequences of water quality degradation for aquatic ecosystems and human use of waterways.
A collection of ID guides to algae. Groups include major freshwater algal groups, diatoms and blue-green (cyanobacteria), red and green algae.