The Weather loach or Dojo loach (Misgurnus anguillicauatus), is a freshwater fish in the loach family Cobitidae. They are native to Asia but are also popular as an aquarium fish. The name Weather loach is shared with several species including the European weather loach (Misgurnus fossilis) and the spotted weather loach (Cobitis taenia). The name weather loach comes from their ability to detect changes in barometric pressure and react with frantic swimming or standing on end. This is because before a storm the barometric pressure changes, and this is known to make the loach more active.