Currently, the most reliable method to estimate the age of tuna is by examination of their otoliths or "ear bones"

An illustrated example, showing how to input data and interpret SolarView results.

The kākahi or freshwater mussel was a valuable mahinga kai resource for many Māori.

The NIWA library collection contains items in a range of formats, covering subjects including atmospheric and climate research, aquaculture, oceanography, fisheries and marine sciences.

These datasets are available in a range of formats.

Sheltered by high country to the west, the eastern zone of the North Island enjoys a dry, sunny climate.

Generally speaking, a drought is defined as a rainfall deficit which restricts or prevents a human activity – for example, farming or power generation.

An overview of what the SHMAK kit comprises, and various uses for it.

The Standardised Precipitation Index (SPI) is a simple measure of drought (and also of very wet conditions) and is based solely on the accumulated precipitation for a given time period.

Monthly climate summaries from December 2001 to the present.

Find out more about submerged aquatic plant species.