Freshwater

Nearly half of New Zealand’s river network is partially or fully inaccessible to migratory fish, a new study shows.

A study investigating the level of change needed to improve the state of Hawke’s Bay’s marine environment highlights the magnitude and frequency of interventions required for the seafloor ecosystem to recover.

NIWA is active in a broad range of eDNA topics and can provide expert advice on applications and expected outcomes. We welcome inquiries into our services and can assist with experimental design.

Can native freshwater algae help restore the mauri of local waterways? Lawrence Gullery investigates.

A group of international scientists are visiting some of New Zealand’s most significant coastal wetlands as part of a five-year research project to help the country adapt and prepare for sea-level rise.

What does science tell us about New Zealand cockles?

Aotearoa-New Zealand’s marine area covers 167,650 square kilometres presenting a staggering distribution of climates, from subtropical to subantarctic waters, to understand and manage.

Specialised monitoring equipment has been installed in Bay of Plenty estuaries to understand whether our coastal wetlands can survive the threat of inevitable sea-level rise.

This guide discusses design principles and provides high-level information about the likely performance of riparian buffers.

New energy efficient streetlights are playing a major role in influencing insect behaviour, says NIWA.

For the first time, satellites have been used to track coastal water health around Aotearoa New Zealand.

Many New Zealand cities and towns have switched over to modern LED street lighting. The move will save on operational costs, but little is known what impact artificial streetlights have on flying freshwater insects which are integral to our waterway ecosystems. NIWA investigated the likely impact as part of a four-year MBIE-funded Smart Idea project.