NIWA expends considerable effort on determining the age of commercial fish species. But why age a fish? And how do we do it?

NIWA’s climate scientists can now confirm what you may have suspected. After carefully poring through more than a century’s worth of data, it has been officially determined that winter 2022 was Aotearoa New Zealand’s warmest and wettest on record.

How can we help you?

Downloadable and printable guides on identification of common freshwater invertebrates found in New Zealand waterways and lakes.

Casal2 is an advanced software package developed by NIWA for modelling the population dynamics of marine species.

Common questions about storms and cyclones in New Zealand.

River floods occur when water spills from a river channel onto land that is normally dry, and are one of New Zealand's costliest natural hazards.

The main characteristic of the Marlborough climate is its dryness. Summer droughts are frequent, and the region is often swept by warm, dry northwesterlies.

Land is tilled, sowed, and harvested for horticultural crops to grow.

Diverting water changes a waterways natural flow

Write a report, with guided questions, to answer the question: “How cold is the Antarctic?”

Freshwater eels have an unusual life cycle which sees them travelling between the ocean, estuaries and freshwaters.