The difference between the long fish and loach: long fish body elongated snake-shaped, rounded in front of the body after the lateral compression, tail pointed thin, head long and round, slightly protruding upper jaw, lips quite developed. The upper and lower jaws and the skull of the mouth have fine teeth, covered by a thin skin. The left and right gill pores are united on the ventral surface in a "V" shape. The gill membrane is attached to the gill isthmus, and the body surface is scale-free, with lubricating fluid to facilitate escape. There are no pectoral and ventral fins; the dorsal and anal fins are degenerated with only skin folds and no soft spines, which are united with the caudal fin. The body is mostly yellowish brown, yellowish or orange when living, with dark gray spots and a little white. The loach has an elongated body, slightly rounded at the anterior end and laterally flattened at the posterior end. The lip is soft and well developed, with fine wrinkles and small protuberances. The head has no fine scales; the body scales are extremely fine and the body surface is rich in mucus. Dorsal fin without hard spines, starting slightly in front above the start of the ventral fin. Caudal fin rounded, with narrow, flat skinfold ribs above and below the caudal peduncle. The body is grayish-black with many small black spots, and the body color often varies according to the living environment.

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