Swan Mussel – Anodonta cygnea

Natural pond filter mussel for clearer water.

The Swan Mussel (Anodonta cygnea) is a fascinating freshwater mollusc that acts as a natural biological filter within garden ponds. These mussels feed by filtering tiny particles, algae and suspended matter from the water, helping to improve water clarity and support a balanced pond ecosystem.

Native to the UK and Europe, Swan Mussels are well suited to ornamental ponds, wildlife ponds and fish ponds, where they quietly perform their natural filtration role on the pond floor.

Natural Pond Water Filtration

Swan Mussels filter water continuously by drawing it through their shells and extracting microscopic organic particles. This natural process can help:

• Reduce suspended particles in the water

• Support clearer pond water

• Contribute to the natural balance of the pond ecosystem

They are often used as a natural complement to pond filtration systems.

Safe for Fish and Wildlife

Swan Mussels are peaceful inhabitants that live quietly on the pond floor and are safe to keep with fish and aquatic plants.

They are suitable for:

• Koi ponds

• Goldfish ponds

• Wildlife ponds

• Natural ponds with established ecosystems

Because they are filter feeders, they require ponds with natural microscopic food sources.

Habitat & Care

Swan Mussels prefer ponds with stable water conditions and plenty of natural microorganisms to feed on.

• Position: Pond floor

• Preferred Depth: 30–100 cm

• Substrate: Soft sediment or pond base

• Pond Type: Established ponds with natural biological activity

They are best introduced into ponds that have been running for some time rather than newly established systems.

Animal Information

• Species: Anodonta cygnea

• Common Name: Swan Mussel

• Type: Freshwater filter-feeding mollusc

• Habitat: Pond floor in established ponds

• Role: Natural water filtration

Important Information

Swan Mussels require established ponds with natural microscopic food sources. They are not suitable for newly installed ponds or heavily sterilised systems where little natural food is present.