NIWA discusses, in depth, this year's most asked question—what is happening to our fresh waterways?

How healthy is your stream? SHMAK - the New Zealand Stream Health Monitoring and Assessment Kit - has been designed to help you find out.

PPM and PPB are units used in atmospheric chemistry to describe the concentration of gases.

One of the most common species of freshwater fish in Aotearoa is the common bully or toitoi.

Data from our research which we make publicly available.

What are the impacts of water dams on water quality and mahinga kai?

To get the most benefit from a fish stock in the long term, we need to maximise our yield without damaging the fish population we rely on.

Hull-mounted on the RV Tangaroa, the EM302 multibeam echosounder maps the seafloor using a fan of 288 acoustic beams, producing up to 864 soundings per ping in dual swath mode, providing 100% coverage of the seabed.

Floods are not unusual in New Zealand, but those that hit us early this winter broke records. Why did they occur? Should we expect more? Can we predict future floods?