Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the DailyCity weather desk. Data from national met services via Open-Meteo.
Dojo loaches, also known as weather loach, are a popular aquarium fish prized for their ability to predict barometric pressure changes. Native to East Asia, these sociable bottom-dwellers can grow to 10 inches and need a spacious tank. In the UK, they are legal but require careful tank management.
Why are dojo loaches called weather loaches?
The name comes from their sensitivity to falling air pressure before storms. When a low-pressure system approaches, dojo loaches become noticeably more active, often swimming near the surface. This behaviour has made them a quirky talking point among British fishkeepers, though it is no substitute for a proper forecast. For the latest conditions, check the UK weather hub.
Dojo loaches tank size and care
Adult dojo loaches need at least a 4-foot tank with a capacity of around 30 gallons. They are social fish and should be kept in groups of three or more. A soft sandy substrate is essential because they love to burrow. The water temperature should stay between 10°C and 25°C; they can even tolerate unheated tanks in a cool room. Several colour forms exist, including wild-type brown and the golden variant, which is one of the most common types of dojo loaches for sale in UK aquatic shops.
Are dojo loaches illegal in the UK?
No, dojo loaches are not banned in the UK. However, they are a non-native species, so you must not release them into the wild. The weather loach banned uk rumour likely stems from confusion with invasive species like the Asian weather loach in other regions.
How big do dojo loaches get?
In a well-maintained aquarium, dojo loaches size typically reaches 15–25 cm (6–10 inches). Some individuals may stay smaller in cramped tanks, but proper space and diet allow them to reach their full potential.
What do dojo loaches eat?
They are omnivorous and readily accept sinking pellets, frozen bloodworms, and brine shrimp. A varied diet keeps them healthy. They also sift through sand for bits of uneaten food, making them useful tank cleaners.
If you are considering dojo loaches for sale, always buy from a reputable UK retailer. For more on what to expect from your tank and local conditions, read our 10 Day Weather Forecast UK guide, as keeping these fish in tune with the seasons can be rewarding.