brackish mussels

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I was curious about this too. I believe the clams that are gathered from the Maryland area are actually brackish. I'm not finding sufficient data to dare to keep one in my tank though. They are called Hardshelled clams.

Habitat:

  • Hard-shell clams occur mainly in bays and estuaries along the coast, from the intertidal zone to depths of about 18 m (60 ft).
  • They are found in a variety of substrates, but prefer sandy bottoms, especially with shell.
    • The shell protects the more vulnerable smaller clams from predators.
  • The clams live buried only about 1 – 2 in below the bay bottom.
Taken from:
http://www.dnr.state.md.us/fisheries/fishfacts/hardshell_clam.asp
 
Common oysters and mussels, like you'd get served at a seafood restaraunt, often live in brackish estuaries. They are intertidal species; I don't know how well they'd fare in constant submersion.

There is a family of oysters called "tree oysters" (Isognomonidae) that normally grows on mangrove roots. Maybe you could get someone who lives in the tropics to mail you a few.
 
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