Freshwater

Dissolved oxygen (DO) is a relative measure of the amount of oxygen (O2) dissolved in water.

Water take (also known as water abstraction) has a range of valuable public and private uses.

This collaborative NZaid project worked with coastal Fijian villagers at Votua on the Coral Coast of Viti Levu to develop pragmatic water supply and waste treatment solutions to protect public health and reduce contamination of coastal waters.

Urbanisation has changed the face of many waterways that flow through urban areas

How may agricultural activities increase sediments in waterways?

The New Zealand Fish Passage Guidelines sets out recommended practice for the design of instream infrastructure to provide for fish passage.

Longfin eels are the largest and longest-lived fish in New Zealand's freshwaters, and where they are present they are the top predator.

A list all of New Zealand's freshwater fish species.

NIWA is doing a nationwide study to discover what makes the best riparian projects. Help us give you the knowledge to make the best riparian management decisions possible by taking our 5 minute survey.

NIWA scientists have written a guide for managing mangroves, prompted by a desire for people to learn more about mangrove ecosystems, and what happens when they are removed.

NIWA provides technical background information on "Clean Water" swimmability proposals.

As New Zealand's "Mr Eel", Niwa's Dr Don Jellyman has heard every tall tale. And some of them may be true.