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Japanese eel

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description Japanese eel Overview

The Japanese eel, *Anguilla japonica*, is a catadromous fish meaning it lives primarily in freshwater rivers and lakes but migrates to the Pacific Ocean for maturation. Native to East Asia, this species is critically endangered due to habitat loss and overfishing. Historically vital to Japan’s culinary tradition—particularly unagi dishes—it remains important for Japanese cuisine and aquaculture. Researchers studying migratory fish and conservationists focus on its preservation.

help Japanese eel FAQ

Where do Japanese eels migrate to spawn in the wild?

Japanese eels migrate thousands of miles from their freshwater rivers in East Asia to a spawning area near the Mariana Ridge in the western Pacific Ocean. After hatching, the larvae drift back on ocean currents to East Asia over several months.

Why is the Japanese eel currently listed as an endangered species?

The population has plummeted by over 80% over the last few decades due to severe overfishing, habitat loss, and changes in ocean currents. Japan's high demand for unagi dishes continues to heavily pressure wild stocks.

Have scientists successfully bred Japanese eels in captivity?

While researchers at the Japan Fisheries Research Agency successfully bred them in captivity in 2010, the process is incredibly complex and expensive. Because of this, commercial eel farms still rely entirely on catching wild glass eels to raise in aquaculture.

What is the typical diet of a Japanese eel in its freshwater habitat?

In their freshwater habitats, Japanese eels are nocturnal carnivores that feed on insects, crustaceans, and smaller fish. They hide in the muddy bottoms of rivers and lakes during the day to ambush prey at night.

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