Freshwater quality

The largest member of the Galaxiidae family.

Temperature affects the number and type of animals and plants that live in a waterway.

Returning water to our waterways after we’ve used it in our homes, on farms and in industry is a complex and challenging process.

Inanga are the predominant species in the modern whitebait fishery.

How do hydro-electricity activities potentially influence waterway temperatures?

There are two methods to determine visual clarity in SHMAK; the clarity tube (or SHMAK tube) and the black disc method.

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

New Zealand’s freshwater and estuarine resources provide significant cultural, economic, social, and environmental benefits. Competition for the use of these resources is intensifying, and many rivers, lakes and estuaries are now degraded.

The tools available for restoring kōura to lakes and streams depend on what is causing kōura to decline.

First, determine if kōura should be present in your stream.

Identifying the factors causing kōura numbers to decline will allow you to determine which restoration tools you need to employ.