Weather loach
Small freshwater fish active before storms
Misgurnus is a genus of true loaches native to Europe and Asia. These small freshwater fish are known for their restless behaviour during pressure changes. Some species serve as food in Asia and are popular in the aquarium trade.
- Active during barometric pressure changes
- Found in freshwater across Europe and Asia
- Grows up to 12 inches in length
- Used as food in parts of Asia
- Popular in the global aquarium trade
What it is
This group comprises true loaches found across Europe and Asia. They are small fish, with adults ranging from six inches to more than twelve inches in length. The name derives from Greek and Turkish roots referring to their loud activity during storms. This behaviour gives them the common names weather loach or weatherfish. They belong to the genus Misgurnus, which contains thirteen recognised species. Their bodies are elongated, typical of loaches, allowing them to navigate freshwater environments effectively.
Where it lives
These fish inhabit freshwater systems throughout Europe and Asia. Their distribution covers a wide geographic area, supporting various species within the genus. Specific locations include regions where species like the pond loach and the European weatherfish are native. They thrive in inland waters rather than coastal or marine environments. The range extends from western Europe across the Asian continent, adapting to local river and lake conditions.
How it lives
Their most notable behavioural trait is increased activity during changes in barometric pressure. This often occurs before thunderstorms, leading to their reputation as weather predictors. They become very active and may appear restless in captivity or the wild when pressure drops. This reaction to atmospheric changes is the basis for their common names. Apart from this sensitivity, they live typical loach lives in freshwater habitats, seeking shelter and food on the bottom.
Fish and people
People in Asia consume some species of this genus as food. They are also valued in the aquarium trade due to their unique behaviour and hardiness. Hobbyists keep them as pets, observing their reactions to environmental changes. The pond loach, also known as the dojo loach, is a common example in the trade. Their role in culture is linked to their ability to signal weather changes, a trait noted by observers for centuries.
Questions people ask about Weather loach
Why are they called weather loaches?
They become very active when barometric pressure changes, such as before thunderstorms. This habit led to names like weatherfish, derived from Greek and Turkish words meaning to hate loud noise or storm activity.
Where do weather loaches live?
They are found in freshwater habitats across Europe and Asia. Different species occupy various rivers and lakes within these continents, adapting to local environmental conditions and water temperatures.
Are weather loaches eaten by humans?
Yes, some species are consumed as food, primarily in Asia. They are also widely sold as pets in the aquarium trade, where their unique behaviour and hardiness make them popular among hobbyists.
Good reading and sources
The facts on this page come from the Wikipedia article "Misgurnus", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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