According to an http://www.nps.gov/archive/npsa/book/index.htm article, “Larval clams swim in the water for about a week, then settle permanently onto the reef to grow.” So, once they attach to the reef, the clams are stuck there for the rest of their lives, which can be a long time.
There are some species of clams that swim by opening and closing their shells and expelling water. This isn’t a very common thing, mostly it is seen in scallops.
Clams do not swim per se, but they do propel themselves through the water using a jet propulsion method of sucking in water and then expelling it. Some species will also bury themselves in the sand to protect themselves before moving on to different areas.
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