Painter's mussel (Unio pictorum) care guide

Group
Other invertebrates
Other names
Painters mussel, Painter's freshwater mussel
Family
Unionidae
Origin
Europe, including Britain (mostly England); slow rivers, canals, lakes and ponds
Water
freshwater
Care level
expert
Flow
Gentle to moderate, well-oxygenated flow

Care

The painter's mussel is a medium-sized freshwater mussel of European slow rivers, canals and lakes, with an elongated brown or yellow-green shell. Its name comes from artists once using the shell as a dish for holding paint. UK native: it is native to Britain, mostly in England. It needs a coldwater (unheated) tank or a large, mature pond, and should not be collected from the wild where that is not allowed; check the rules first. Our sources have little on this species; the figures are general guidance, not from a source. Feeding guide: filter feeders like this are hard to keep fed and often starve slowly in aquariums. Freshwater mussels filter microscopic algae and fine particles. A clean, new or small pond or tank rarely has enough, and most mussels added to garden ponds die within months, often unseen in the mud, and then foul the water. Only keep one in a large, established, planted pond or tank with a soft sand or fine gravel bed to bury in. It is protected in some countries (for example Germany), while the IUCN rates it Least Concern. Copper: copper-based medicines and some plant fertilisers are toxic to shrimp, snails and most other invertebrates. Never dose them in a tank holding this animal, and read the label of any treatment, fertiliser or algae remover before use. Sources: Wikipedia (en.wikipedia.org/wiki/Uniopictorum). Checked October 2026.

Diet

Filters phytoplankton, bacteria and fine organic particles from the water. In a tank, add liquid phytoplankton or green water regularly; it cannot be fed on ordinary fish food.

Breeding

Like other river mussels, females brood larvae (glochidia) in their gills and release them to attach briefly to the gills or fins of a host fish, then drop off as tiny mussels. This needs suitable native fish and does not happen in a typical aquarium.

Compatibility and tank mates

Peaceful and harmless. Fish do not usually bother it, but crayfish and large snails may attack weak mussels. Never keep with goldfish or koi that dig it out of the substrate. Needs a host fish to breed.

Last updated 8 October 2026. Community-edited care guide on Aquatic-Auctions.

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