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My answer to that would be to follow the same precautions/procedures when introducing anything new. Hitchhikers are a frequent occurence whether it's on rocks, fish, corals ANYTHING!
So just to summarize a few methods I have heard people follow:
-Hold for monitoring in a hospital tank 1-2 weeks
-Fresh Water dip
-Flat worm solution dip
-Hypo salinity treatment
I would also review the process stores follow for harvesting and selling clams.. It seems to me manilla clams are out of the water and even refrigerated before they are sold. I'm not sure how many bugs could survive that treatment.
I will say this: Everything comes from the ocean that is not aquacultured and can potentially carry unwanted pests. The irony is that some of the worst hitchhikers are more prolific and passed at the vendors holding tanks versus directly from the ocean... (red bugs, flat worms ect)
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