Asian Clam

Corbicula fluminea


  • Usually smaller than 25 mm (but can grow up to 65 mm in length)
  • Yellowish-green to light brown shell with concentric, evenly spaced, distinct ridges on shell surface
  • Occurs in streams, rivers, lakes & reservoirs, and irrigation and drainage canals
  • Fresh water filter feeding clam, native to Southeast Asia, Australia, Africa, Indonesia, and Turkey
  • Common in aquariums and ornamental ponds (may be sold as “pygmy” or “gold” clams)

Consequences of invasion

  • Cause biofouling & clogging of water treatment systems & pipes and power plants resulting in increased costs to users
  • Alter water chemistry and contaminate drinking water with algal blooms
  • Occur in high densities: a single clam can create a new population due to self-fertilization, producing up to 70,000 eggs/year
  • Compete with native species for food and habitat

Integrated pest management options

Asian Clams. Credit: F. Folini.

Additional resources