longfin eel, lives longer than most people

Size
Length: 80–120 cm, Weight: 2–10 kg
Lifespan
30–60 years
Diet
Small fish, crustaceans, worms and carrion. Found in almost every river, lake and high-country stream across New Zealand. Masters of the hidden crawl, able to move through wet grass and over damp rocks to reach landlocked ponds.
Habitat
Almost every river, lake and high-country stream across New Zealand. Masters of the hidden crawl, able to move through wet grass and over damp rocks to reach landlocked ponds.
Range
Throughout the North and South Islands in almost every river, lake and high-country stream. Most common in lowland waterways but also found in headwaters above waterfalls and natural barriers.
Endemism
Endemic
Main Threats
Commercial overfishing is the primary threat, with large numbers exported to Asia. Habitat loss from wetland drainage and stream modification. Hydro-electric dams blocking migration routes to the Pacific.
Population
At Risk - Declining. Facing a triple threat of commercial fishing, habitat loss and massive hydro-electric dams that block their once-in-a-lifetime migration.
Conservation Status
At Risk - Declining
Look into a deep river hole and see a thick dark log that suddenly blinks. That is a longfin. It is a muscle-bound fire hose with a face, reaching up to two metres long. A creature from a gothic horror. The life story of the longfin is a century-long epic. A female may live in a single stretch of river for 80 to 100 years. She slowly accumulates fat reserves for her final act. The patience is extreme. The lifespan is exceptional. Intelligent and curious. Longfins are known to beg for food from regular visitors. They even recognise individual humans. They spend their days wedged under logs or undercut banks. They emerge at night to hunt everything from kōura and insects to small ducks and even other eels. The landlords of the river. The dominance is total. The territory is defended. The appetite is indiscriminate. When the time finally comes, triggered by a specific moon phase and a flood, the silvering begins. The eel stops eating. Its digestive tract shrivels. Its eyes double in size for deep-sea vision. Its skin turns metallic silver. This is the suicide mission. Every longfin in New Zealand eventually leaves its home. It swims thousands of kilometres into the Pacific Ocean. Likely near Tonga or Fiji. There, in the crushing depths, they spawn once and die. The journey is one-way. The purpose is singular. The end is absolute. The longfin is now a refugee in its own waters. Because they only breed once at the end of a long life, every eel caught before migration is a genetic dead end. They are the ancient, slippery heart of our waterways. A creature that demands respect. A bit of fear. And a lot of room to move. The status is precarious. The history is deep. The future is uncertain. To catch one is to interrupt a century of accumulation. The loss is permanent. The replacement is distant. The cycle is broken. The river feels the absence. The ecosystem shifts. The guardian is gone. No one told it otherwise.