Han (Korea)

Iksookimia koreensis is a cobitid loach endemic to Korea, relatively common in river drainages of northern and western South Korea. It is most similar to I. pumila, formerly treated as a subspecies, but has 10 or more dark bars on each flank, saddle-like markings along the back and irregular spots over the upper body. It apparently prefers small, shallow rivers and streams with moderate to fast currents, and needs clean, well-oxygenated water.

Hemibarbus mylodon is a cyprinid endemic to the Korean peninsula, where it occurs throughout North Korea and South Korea. A predominantly riverine fish, it lives in clear, well-oxygenated running water over sand, gravel, rock or mud, and adults tend to form schools just above the substrate in faster-flowing sections.

The Korean bitterling, Tanakia signifer, is endemic to the Korean peninsula, where it occurs in southern North Korea and northern South Korea. It is considered endangered in South Korea, where it lives only in the Han river system and many populations have been extirpated. It inhabits cool, clean, shallow water over coarse sand or gravel, and like all bitterlings it spawns in living unionid mussels.