Freshwater

The River Environment Classification (REC) is a database of catchment spatial attributes, summarised for every segment in New Zealand's network of rivers.

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

How may agricultural activities increase sediments in waterways?

We have prepared a breakdown of the different guidelines that are available for sampling freshwater fisheries. The overview provides links to key documents that explain what should be considered when designing fish monitoring studies and how to implement the various sampling techniques.

Forest plantations in Aotearoa can be found on flat, gently rolling, or very steep terrain.

What are the potential sources of chemical contamination from agricultural activities?

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

Blooms of hazardous cyanobacteria (blue-green algae) in rivers, lakes and reservoirs can cause problems for both animal and human health. How can you find out whether an algal bloom is potentially toxic?

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

Grey mullet have a worldwide distribution and Aotearoa is at the southern limit of their range.

How may forestry activities increase sediments in waterways?

The land used to produce crops is usually flat to gently rolling so it can be tilled, sowed, and harvested.