In this 1992 Wild South documentary, pioneering underwater photographers Wade and Jan Doak investigate how fish have evolved over 400 million years on the Northland coast. They explore ocean dwellers off the Poor Knights Islands, where myriad nimble life forms thrive — from radar-like sensory systems and kaleidoscopic colouring, to the intricacies of jaw and fin shape. The Doaks conduct novel experiments to showcase them on camera in this Natural History New Zealand production. This episode was narrated by nature documentary filmmaker Peter Hayden.