On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Migrant shortfin male that has been unable to migrate downstream due to the presence of a large in-stream structure

This migrant shortfin male has been unable to migrate downstream due to the presence of a large instream structure. In some cases, like the tuna pictured, an eel can lose condition when migration is delayed. Credit: Jacques Boubée