03/05/2026
This is just one of the many reasons that spurred us on to develop the Okarito Plant Project - while we're not changing the world, we are engaging and providing an awareness and educational tool for people of all ages. People often ask us if there are eels in the Okarito waterways, and yes there are. It would be a sad day to have to say...there used to be. Let's keep working together for clean waterways - its something we can all do together.
🐟 What’s Happening to Our Ika? A Global Collapse, Reflected in Native Fish Here in Aotearoa.
A new UN report reveals a global 81% decline in migratory freshwater fish since 1970. These species share one thing: they need connected rivers to move between freshwater and the sea.
Of our 51 native freshwater fish species, most are migratory - and many are diadromous, moving between rivers and the sea to complete their lifecycles.
Tuna, īnanga, kōaro, shortjaw kōkopu, kanakana are species that must move. Their survival depends on access and the ability to travel from river headwaters to coastal waters and back again. 76% of our indigenous freshwater fish species are threatened with extinction or at risk of becoming threatened.
Tuna (longfin eel) are a stark example: dams, weirs, and culverts block migration, and with some females living 90+ years, every barrier compounds the problem. Īnanga face similar pressures - their eggs need riparian cover, juveniles need clear passage, and culverts disrupt the cycle.
Protecting migratory fish means managing rivers as connected ecological and cultural systems. Taonga species like tuna, kōaro, and kanakana are vital to iwi and hapū knowledge and culture.
Solutions exist:
• Fix or remove barrier culverts
• Restore riparian margins
• Protect lowland spawning streams
• Ensure rivers flow for fish
The message is clear: connectivity is survival. Our rivers and our ika are telling us it’s time to act.
Read more: https://www.endangeredspecies.org.nz/post/what-s-happening-to-our-ika
📸 Tuna – Longfin eel – Jason Burton