shortfin eel, every river has one

Size
Length: 60–100 cm, Weight: 1–5 kg
Lifespan
15–25 years
Diet
Feeds on small fish, crustaceans, worms and carrion. Lives in lowland rivers, lakes, wetlands and estuaries. A lowland wanderer. Adaptable, tough and almost impossible to kill effectively.
Habitat
Lowland rivers, lakes, wetlands and estuaries. Often in warm, murky, slow-moving water. The eel of the farm drain and city creek. Adaptable, tough and almost impossible to kill easily.
Range
Throughout North and South Islands in lowland rivers, lakes, wetlands and estuaries. Most common in warm, murky, slow-moving water. Also found in Australia and Pacific islands regionally.
Endemism
Native
Main Threats
Commercial fishing, habitat loss from wetland drainage and dams blocking migration routes are primary threats. Water pollution and climate change also impact populations significantly across range.
Population
At Risk - Declining. Still common in many lowland waterways. Numbers have dropped significantly due to habitat loss, dams and commercial fishing. More resilient than longfin cousins but not invincible.
Conservation Status
At Risk - Declining
The tough adaptable cousin of the longfin. An eel that lives where others cannot. Shortfin eels look similar to longfins. But the dorsal fin starts further back. It sits closer to the tail. The body is shorter and thicker. Mottled olive-green to brown covers the back. It fades to a pale yellowish belly. Thick slimy skin is covered in mucus. This layer protects from parasites. It helps the eel slide through tight spaces. An eel built for the lowlands. The morphology suits the mud. Survivors of the lowland waterways. Shortfin eels live in warm, murky, low-oxygen water. This would kill a longfin eel. They can crawl over damp ground. They reach a new pond when their old one dries up. They survive out of water for hours. They hide in mud or under a log. They wait for rain to return. They eat almost anything. Insects, worms, small fish, dead animals. Even bait off a hook. An eel that does not complain about the menu. The appetite is indiscriminate. The survival is assured. These are the eels that most Kiwis have actually seen. The ones that live in the farm pond. The city creek. The stormwater drain. Not as famous as the longfin. Not as impressive. But tougher. More adaptable. More widespread. An eel that does not need to be famous. The recognition is local. The presence is constant. It occupies the margins. It thrives in the neglect. To catch a shortfin eel is to catch the survivor. The eel that lives where no other eel can live. It eats what no other eel can eat. It keeps going when everything else gives up. The eel of the lowland drain. The one that lives in brown water. Under concrete. In the shadow of the city. A tough slimy unkillable survivor. The resilience is biological. The habitat is accidental. The drain is dark. The water is brown. The shortfin eel slides through the mud. It hunts. It eats. It survives. The city grows above. The eel does not care. The indifference is strategic. Attention brings danger. Obscurity brings safety. It has been here longer than the city. It will be here after the city is gone. The timeline is geological. The infrastructure is temporary. The eel persists. It waits for the concrete to crack. It waits for the water to rise. It carries on.