At first glance, Aotearoa New Zealand’s migratory freshwater fish and little-known 19th century scientists don’t seem to have much in common. But take a closer look. Thanks to equations developed over 170 years ago, we’re learning more about how fish can better navigate our waterways.

The climbing galaxias (kōaro) - one of Aotearoa New Zealand’s migratory species of freshwater fish. Photo:

Screenshot from the team's fluid dynamics model.

An engineered rock edge under construction.