Freshwater

Under the light of the moon where the river meets the sea, NIWA researchers are planning to catch tiny fish that are all but invisible to the naked eye.

NIWA has established a network of high elevation electronic weather stations to provide a solid basis to understand seasonal patterns and long-term changes to seasonal snow and ice in alpine regions of New Zealand.

The alp-fed braided rivers of Canterbury are treasured for their landscape, recreational amenities, salmon- and trout-fishing, and unique riverine environments – which provide habitat to a host of endangered birds – but they are under threat from land-use intensification and a growing demand for irrigation water.

Of the more than 70 aquatic plant species naturalised in New Zealand, more than 75% have become problem weeds or have been assessed as having the potential to become future problem weeds. Most of our lakes, rivers and streams are affected by at least one of these species.

Braided rivers are an arena where woody weeds and floods are in constant competition with each other.
Braided rivers naturally flood frequently, repeatedly mobilising their bed sediments and shifting their multiple channels.

At the bottom of our lakes are NIWA divers with waterproof clipboards. Sarah Fraser jumps in to find out what they’re doing.

Taonga species such as tuna (freshwater eels), kōura (freshwater crayfish) and kākahi (freshwater mussels) are central to the identity and wellbeing of many Māori.

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 freshwater scientists are pinning their hopes of solving an age-old mystery on 10 female longfin eels who are about to begin an epic journey to their spawning grounds somewhere in the Pacific Ocean.

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

The latest state of the environment report released today provides New Zealanders with clear evidence that our climate, freshwater and marine systems are changing, says NIWA.