05/05/2025
One of the biggest threats īnanga face comes before they've even hatched 🐭
These native fish lay their eggs above the waterline, where pests like rats, mice, and hedgehogs will gobble them up, given half a chance. The stakes are high: a single rat can wipe out hundreds of eggs and destroy a spawning habitat.
Autumn and early winter are peak times for rat population numbers, overlapping with īnanga spawning times. That's why it's vital to set traps around īnanga spawning areas — just like the artificially installed one in the picture. It ensures the eggs have the chance to grow, hatch, and fulfil the vital role īnanga have in our marine and freshwater ecosystems.
This site is at Te Wharau Creek, Greenhithe, and is part of the Upper Harbour Īnanga Spawning Project funded by Upper Harbour Local Board. Huge thanks to Louis from Upper Waitematā Ecology Network, who we are working with to protect īnanga spawning sites around the Greenhithe area, and Nicola from Greenhithe Community Trust for assisting us with checking the artificial habitat 🐟🌿