[freshwater species] Oder Perciformes Family Odontobutidae(Freshwater sleepers) Yalu dark sleeper Odontobutis yaluensis(Wu, Wu & Xie, 1993). 20cm TL Korean name/ggeol-dong-sa-ri(껄동사리) D1/spine 5~8, D2/spine 1 soft ray 9-10. A/spine 1 soft ray 7-9. LR/40.
Distribution; Asia/Yalu river, Choeng-cheon river in North Korea and west southern region of Manchuria in China. General; Head slightly depressed. Fore body cylindrical, compressed posteriorly. Oculoscapular sensory canal system reduced; when present, 1 or 2 short canals. Preopercular canals absent. Deferent from other congeners of same genus in that occipital scales spirally arranged. Mouth large, lips very thick, lower jaw longer than upper jaw. Small, sharp, and curved backward teeth on both jaws. With 2 separated dorsal fins. Length of pectoral fin not surpass the origin of second dorsal fin. Pelvic fins do not form sucker shape and located below pectoral fin. margin of caudal fin rounded. Body with brown ground color, irregular dark brown blotches scattered. Fins with rows of dark spots. Inhabit gravel bottoms. Feed on benthic animals. Ecological data deficient.
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