Odontobutis obscurus
Odontobutis obscurus
© FishBase (CC BY-NC)Odontobutis obscurus, commonly known as the dark sleeper, is a small, nocturnal freshwater fish found in East Asian rivers and streams. It grows up to about 17.5 cm and is prized by local anglers for its subtle fight and mild, edible flesh.
Basic Information
Family
Odontobutidae
Max Size
17.5 cm
Habitat
freshwater
Climate
temperate
Best Season
Spring (April‑June) and early summer (July)
Best Time
Dawn and dusk, when the fish are most active
Distribution
No distribution map available
Fishing Tips for Odontobutis obscurus
- Use light ultralight tackle (2‑4 lb test) and a small jig or live worm near the bottom.
- Target areas with cover such as submerged rocks, overhanging vegetation, or leaf litter where the fish hide.
- Cast or drift slowly and allow the bait to rest on the substrate; a gentle lift‑and‑drop retrieve mimics natural prey.
- Fish during low-light periods (early morning or evening) when the nocturnal species moves out to feed.
Top Fishing Locations for Odontobutis obscurus
Seomjin River
South KoreaRenowned for abundant Odontobutis obscurus in clear mountain streams.
Best: April-October
Hantan River
South KoreaKnown for night fishing for dark sleeper in deep pools.
Best: May-September
Lake Biwa
JapanLarge freshwater lake with diverse habitats supporting Odontobutis obscurus.
Best: June-September
Nakdong River
South KoreaMajor river system where dark sleeper gathers during spawning.
Best: March-May
Yalu River (Amnok River)
ChinaBorder river with strong currents, known for occasional catches of Odontobutis obscurus.
Best: July-August
Kumano River
JapanPristine river in Kii Peninsula, prized by anglers seeking the dark sleeper.
Best: April-June
Market Prices
Recommended Fishing Equipment for Odontobutis obscurus
Recommended Equipment
Best bait: Live worm or minnow, N/A if using soft plastic