New Zealand grayling
Extinct amphidromous fish endemic to New Zealand rivers and seas.
The New Zealand grayling was a medium-sized native fish that migrated between rivers and the sea. Once abundant and prized by Māori and settlers, it vanished in the early twentieth century due to habitat loss, overfishing, and introduced trout. It is now classified as extinct.
- Last confirmed sighting occurred in 1923
- Declared extinct in 2018 by NZ Department of Conservation
- Only native NZ freshwater fish to receive full legal protection
- Migrated between freshwater rivers and coastal seas
- Outcompeted and preyed upon by introduced trout species
What it is
This fish was a slender, medium-sized species reaching up to 45 cm in length. It possessed an adipose fin and a blunt, rounded snout. Its upper jaw held a comb-like row of long, blunt teeth, while the lower jaw had smaller, sharper teeth. The body colour shifted from silvery to grey, brown, or gold during migration, with a light underbelly. Despite its name, it lacked the large dorsal fins typical of European graylings.
Where it lives
The species lived throughout both the North and South Islands. In the nineteenth century, it was widespread, but its range shrank to isolated streams in East Cape, Wairarapa, Otaki, and the West Coast by the twentieth century. It inhabited freshwater rivers and streams during autumn and winter, migrating to coastal seas in early spring. This amphidromous life cycle required access to both riverine and marine environments.
How it lives
The fish moved in large shoals, particularly during migration. It fed on aquatic insect larvae like caddisflies and plants such as waterweeds found on riverbed rocks. Its dentition suggests it was omnivorous, possibly herbivorous at times. As an amphidromous species, it faced different risks in freshwater compared to the sea. Predation and competition increased significantly after the introduction of non-native trout species.
Breeding and life cycle
Spawning occurred in freshwater rivers. After breeding, the fish migrated to the sea. They returned to freshwater to reproduce again. This cyclical movement between saltwater and freshwater defined their life history. The exact timing of egg hatching and juvenile growth is not detailed, but the migration pattern was seasonal, with sea entry in early spring.
Fish and people
Māori hunted the fish using basket traps called hīnaki, often placed overnight in rivers. Another method involved startling fish into nets. Early European settlers also prized it as a sporting fish, catching hundreds at once. Abundance declined in the 1870s, leading to legal protection in 1951. It remains the only native New Zealand freshwater fish to have received such protection, though it was already gone.
Status and threats
The last confirmed sighting was in 1923, with unconfirmed reports until 1929. It was declared extinct in 2018. Causes included deforestation, sedimentation, pollution, and overfishing. Introduced brown and rainbow trout competed for resources and preyed on the grayling. A pathogen carried by trout may also have contributed. The loss of suitable source rivers turned habitats into sinks, preventing successful reproduction.
Questions people ask about New Zealand grayling
Is the New Zealand grayling related to European graylings?
No, it is not related to true graylings of the genus Thymallus. It belongs to the family Retropinnidae and is closely related to the Australian grayling. It lacks the characteristic large dorsal fins of European species.
Why did the New Zealand grayling go extinct?
Multiple factors caused its decline, including habitat degradation from deforestation, pollution, and overfishing. The introduction of brown and rainbow trout led to predation and competition. A pathogen vectored by trout may have also played a role.
How did Māori traditionally catch this fish?
Māori used basket traps known as hīnaki, lodged in rivers to catch fish swimming downstream. They also used methods where one group startled fish with sticks while another waited downstream with nets to capture them.
Good reading and sources
- New Zealand grayling on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "New Zealand grayling", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
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