Freshwater Quality

Latest news

Can native freshwater algae help restore the mauri of local waterways? Lawrence Gullery investigates.
What does science tell us about New Zealand cockles?
For the first time, satellites have been used to track coastal water health around Aotearoa New Zealand.
NIWA has updated and restarted a course using a riparian planning tool developed by one of its former chief scientists more than 20 years ago.

Latest videos

SHMAK Habitat - Rubbish

The SHMAK method for rubbish involves collecting and identifying all the rubbish (litter) in the stream and on the stream banks. It was designed to complement rubbish assessments on our beaches so the data is comparable.

SHMAK Habitat – Visual Habitat Assessment

The SHMAK visual habitat assessment needs no equipment, only your eyes. It gives your stream a score that you can use to assess changes over time or compare streams.

SHMAK Habitat – Streambed Composition

There are two methods for describing streambed composition: the visual assessment method is quicker while the Wolman walk is more accurate.

SHMAK Stream Life – How to Sort and Identify your Benthic Macroinvertebrate Sample

An ice-cream tray provides an excellent container to isolate and separate your benthic macroinvertebrates. The SHMAK Benthic Macroinvertebrate Field Guide can help you with your identifications. Posting a photo to the Freshwater Invertebrates NZ project in iNaturalist can help you identify any invertebrates you don’t recognise - https://inaturalist.nz/projects/fresh... When you enter your data into the NZ Water Citizens website - https://nzwatercitizens.co.nz/ - you can use the online calculator to calculate a health score.

Some of the world’s most ancient and fascinating animals have been re-discovered in southern New Zealand. Prospects for their survival look good – provided groundwaters and wetlands are protected.

A high proportion of New Zealand’s native freshwater fish fauna need to migrate to and from the sea.
This project was undertaken for Auckland Regional Council to identify significant sources of contaminants in the central Waitemata and southeastern Manukau Harbours.
Simple steps to minimise the effects of chemical contamination on water quality and mahinga kai.
Here are some simple steps to minimise the effects of nutrient overloading on water quality and mahinga kai.
Simple steps to minimise the effects of infectious substances on water quality and mahinga kai.
Here are some simple steps to minimise the effects of sediment on water quality and mahinga kai.
References, further reading, and links to useful websites.
Learn about the Resource Management Act, Resource Consents, and how to prepare a submission.
Dissolved oxygen (DO) is a relative measure of the amount of oxygen (O2) dissolved in water.
Water clarity or turbidity is the cloudiness or haziness in a fluid caused by individual small particles (suspended solids).
Lakes and estuaries can be described by their nutrient status.
Temperature affects the number and type of animals and plants that live in a waterway.
Nutrients in waterways are essential for the growth of algae and aquatic plants but too much can destroy an ecosystem.
Waterways can easily become contaminated by pathogens when effluent is discharged nearby.

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

Piharau/kanakana are an important mahinga kai species and a prized delicacy for many Māori.
The kākahi or freshwater mussel was a valuable mahinga kai resource for many Māori.

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All staff working on this subject

Principal Technician - Marine Ecology
Principal Scientist - Ecosystem Modelling
Principal Scientist - Aquatic Pollution
Principal Scientist - Catchment Processes
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Riparian and Wetland Scientist
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Land and Water Scientist
Surface Water - Groundwater Modeller
Principal Scientist - Aquatic Pollution
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Water Quality Scientist
Hydrology Scientist
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Catchment Modeller
Regional Manager - Auckland
Maori Organisational Development Manager
Algal Ecologist
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Principal Technician - Environmental Chemistry and Toxicology
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