When fresh water meets salty water - a classroom exercise that explores the physics of estuaries.

Dog Island levels

The need to provide upstream passage facilities for ensuring the long term sustainability of migratory freshwater fish populations is now well recognised.

Stormwater poses risks to NZ’s urban streams & coastal waters, affecting ecological health & the cultural, social, & economic value of these environments.

Trees are grown and converted into a range of useful timber and paper products.

CASAL is an advanced software package developed by NIWA for fish stock assessment.

NIWA's mission is to conduct leading environmental science to enable the sustainable management of natural resources for New Zealand and the planet.

These datasets are available in a range of formats.

All species of freshwater tuna spawn at sea, although the spawning grounds of only four species are known with certainty worldwide.