The Chatham mudfish (Neochanna rekohua), formerly known as the Chathams galaxias (Galaxias rekohua), is a galaxiid fish endemic to two small, peaty lakes in southern Chatham Island, New Zealand. It was discovered in 1994 by C.P. Mitchell, who initially placed it in the genus Galaxias, and gave it the species name rekohua after the Moriori word for the Chatham Islands. In 2004, R.M. McDowall reassigned it to Neochanna based on its external anatomy, behaviour, and skeleton, and this was subsequently supported by a genetic analysis.