Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the BritainNow weather desk. Data from national met services via Open-Meteo.
Dojo loaches, also known as weather loaches, are hardy freshwater fish that can grow up to 10–12 inches in the wild and are famously sensitive to barometric pressure changes, often becoming more active before a storm.
What size do dojo loaches reach and what tank size do they need?
Dojo loaches size varies by environment, but in captivity they typically reach 6–8 inches, though some exceed 10 inches with good care. Because they are active bottom-dwellers, a dojo loaches tank size should be at least 75 litres for one fish, with an additional 40 litres per extra loach. They thrive in groups, so aim for three or more in a spacious tank with soft substrate to protect their sensitive barbels.
Are dojo loaches banned in the UK?
The weather loach banned UK status is a common concern, but dojo loaches are not currently banned from sale or ownership under the Wildlife and Countryside Act. However, they are considered invasive in some wild habitats, so you must never release them into ponds or rivers. If you’re looking for dojo loaches for sale, always buy from reputable UK breeders who can confirm they are captive-bred.
What types of dojo loaches are available?
There are several types of dojo loaches, including the standard brown-grey wild type and the popular “golden” or “orange” colour morph. Albino varieties are also common. All share the same care requirements and eel-like body shape. Temperament-wise, they are peaceful community fish, though they may eat very small shrimp or fry.
Are dojo loaches illegal to keep in the UK?
No, dojo loaches are not illegal to keep in the UK. They are not listed under Schedule 9 of the Wildlife and Countryside Act, so you can buy and keep them without a licence. Just never release them into the wild.
Why are they called weather loaches?
They earned the name because they become unusually active, darting around the tank, when barometric pressure drops before rain or storms. Some keepers use them as a natural weather indicator, though it is not an exact science.
Can dojo loaches live with goldfish?
Yes, they can live with goldfish in a cool-water tank, as both prefer temperatures between 10–22°C. Ensure the tank is large enough (at least 150 litres for a mixed group) and that goldfish are not overly boisterous during feeding.
For more on keeping fish in a British climate, check our UK weather hub and the 10-day forecast to plan water changes around temperature swings.