Lakes

Restoration of aquatic ecosystems

This project aims to increase our knowledge of aquatic ecosystems and their restoration, and apply this to degraded streams, rivers, lakes and estuaries.

We don’t know much about lakes and climate change, says researcher

Media Release

5 March 2020

Scientists know so little about how storms affect the delicate balance of lake ecosystems that we may be unable to protect them from the effects of climate change, says a NIWA scientist.

The new Lake Restoration Handbook - A New Zealand perspective

The Lake Restoration Handbook: A New Zealand Perspective addresses this need through a series of chapters that draw on recent advances in modelling and monitoring tools, citizen science and First Peoples’ roles, catchment and lake-focused restoration techniques, and policy implementation.

Rotorua Te Arawa lakes

NIWA scientists jump overboard to check out the health the Rotorua Te Arawa lakes. The work is part of NIWA's national LakeSPI programme—an ecological health check for lakes throughout New Zealand.
Underwater research to protect and maintain New Zealand's freshwater resources.

Freshwater Update 81, June 2019

Freshwater Update 81 brings you the latest information from our Freshwater & Estuaries Centre, with articles ranging from how NIWA scientists are solving the longfin eel migration mystery, how we're taking you diving with us at Fieldays, and a word from one of the editors of the new Lakes Restoration Handbook.

Come jump in a lake with NIWA

Media Release

5 June 2019

Visitors to NIWA’s stand at this year’s Fieldays are invited to go diving into the Rotorua lakes—without having to get wet.

NIWA mapping Whakatipu lake floor

Media Release

8 May 2019

NIWA researchers are out on Lake Whakatipu for the next week mapping the lake floor for the first time.

The search for a long-lost plant to bring life back to our coastal lakes

The plight of some coastal lakes in Canterbury is well-known. Many were once abundant mahinga kai site for local Māori, some are now the most polluted waterbodies in the country.

Freshwater Update 80, March 2019

Freshwater Update 80 brings you the latest information from our Freshwater & Estuaries Centre, with articles that cross a broad spectrum of freshwater research. This edition has articles about the sources of plastics in our waterways, the discovery of long-lost lake plant species and a breakthrough in research about freshwater mussels/kākahi.

Lake Rotoiti catfish cull

A NIWA research programme—Control of Invasive Fish—is working with Bay of Plenty Regional Council this year to create novel tools to support the catfish control programme.

Freshwater Update 79, November 2018

Freshwater Update 79 brings you the latest information from our Freshwater & Estuaries Centre, with articles ranging from NIWA working with NASA; restoring a stream catchment in Kaikōura; looking after urban water; keeping soil and reducing sedimentation; to culling catfish.

The value of archived biological collections: understanding the lake snow invasion

The diatom (Lindavia intermedia) that causes lake snow—nuisance slime in clean-water lakes that ruins angling and can block water intakes—was apparently introduced to New Zealand shortly before 2002, but was widespread by 2005.

Freshwater Update 78, September 2018

Freshwater Update 78 brings you the latest information from our Freshwater & Estuaries Centre, with articles that cross a broad spectrum of freshwater research, from archives to aquifers, periphyton guidance, geo-engineering and swimmability.

A clearer look at Te Waikoropupū Springs

Te Waikoropupū Springs near Takaka are the largest freshwater springs in New Zealand, the largest cold-water springs in the Southern Hemisphere, and are nationally and internationally valued for their remarkable colour and clarity.

Stepping into the river

Feature story

11 June 2017

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

Monitoring and maintenance of kōura

Once you have identified the problem, and applied the necessary tools for restoring kōura to your stream, the next phase of your project is to monitor the site to see whether restoration works.

Applying the right tools to restore kōura to lakes and streams

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

Why are kōura rare or absent in your waterway?

Habitat and biological factors factors affect why kōura rare or absent in your waterway.

Are kōura present in your waterway?

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

Identifying the problem for kōura

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

Guide to restoring kōura (freshwater crayfish) in lakes, rivers and streams

Habitat degradation and the introduction of exotic plant and fish species have adversely affected kōura populations throughout New Zealand. However, there are a number of measures that we can use to restore kōura populations in lakes, rivers and streams.

Launch at lake for weed management plan

Forty dignitaries and agency representatives gathered at Lake Karāpiro to officially launch a management plan for hornwort prepared for Land Information New Zealand (LINZ) and a stakeholder group by NIWA. The plan is aimed at reducing the nuisance impacts of the submerged weed hornwort (Ceratophyllum demersum) at this world-renown aquatic sporting venue. NIWA worked collaboratively with LINZ, Waikato Regional Council, Waipa District Council, local iwi and Mercury in developing lake weed management goals and objectives for the next ten years.

Implications of climate change for New Zealand’s freshwaters

Climate change is one of the defining societal and environmental challenges of the 21st century, for New Zealand and the planet.

Freshwater Update 71, November 2016

Freshwater Update 71 brings you the latest information from our Freshwater & Estuaries centre, including stories about: the implications of climate change on our freshwater; blocking nature to nuture a lake ecosystem; nine new freshwater and estuaries research programmes; and all about a co-development workshop for freshwaters.

Mercury biomagnification in three geothermally-influenced lakes differing in chemistry and algal biomass

This research project aimed to understand the causes behind differences in mercury in trout and other organisms in the Bay of Plenty/Te Arawa lakes—in particular what features of each lake explain why mercury in trout is higher in some lakes than in other lakes.

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