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Alewife floater (Anodonta implicata)

Alewife floaterPhotograph courtesy of E. Nedeau

NH Conservation Status: Not listed


NH State Rank Status: Vulnerable to extirpation or extinction (globally secure)


Distribution: Parts of the lower Connecticut, Merrimack, and coastal watersheds. See which watersheds and/or waterbodies PDF Document the species has been documented.


Description: A large, elongate and thin mussel reaching 6-7 inches in length. Shells are usually yellowish-brown or blackish and have prominent growth lines. The inside shell is usually a white or pinkish color.


Commonly Confused Species: Eastern floater, creeper


Habitat: Rivers, streams, ponds, and lakes with either constant or absent flow. Substrate varies from cobble to silty or sandy.


Life History: Host fish include the anadromous alewife, blueback herring, and American shad.


Conservation Threats: Pollution, dams restricting anadramous fish distribution.