Pond loach

The weather loach or dojo loach (Misgurnus anguillicaudatus) is a remarkably adaptable species native to Siberia, Korea, Japan, China, and northern Vietnam, with introduced populations now established across Europe, North America, and Australia. It inhabits shallow, slow-moving sections of rivers, swamps, oxbows, and paddy fields with soft mud or silt substrates and dense vegetation. Its eel-like body, reaching up to 28 cm in length, is marked with irregular dark spots and blotches over a tan or olive-brown base. The common name "weather loach" derives from its reported sensitivity to barometric pressure changes, which can trigger increased activity before storms. This species possesses intestinal respiration, allowing it to gulp atmospheric air and survive in hypoxic conditions. The aquarium should be at least 120 cm in length with a soft sandy substrate to accommodate its burrowing behaviour — coarse gravel can injure the fish. It appreciates dim lighting, driftwood, and leaf litter. Despite its hardiness, this is not a tropical species; it should be maintained at cooler temperatures between 18 and 23 °C. It is peaceful with medium-to-large tankmates but may prey on very small fish or eggs. Individuals often develop distinct personalities and may become tame enough to hand-feed.