Thanks CJ. I remember that thread now just hadn't read the whole thing.
While searching the subject I found this intresting:
http://pubs.aina.ucalgary.ca/arctic/Arctic60-2-124.pdfStudy shows many mollusks/clams/snails can pass thru fish unharmed.
The gut-survival data from this study indicate that fish
are dispersal agents for some freshwater mollusks. If fish
predators were non-migratory or sedentary during feeding
season, many mollusks would be expelled alive near the
sites where they were initially ingested. But if fish migrated
after feeding, they would transport the mollusks to
more distant locations.
I wonder if they were alive in the fish's gut when a migrating bird ate them if they would survive the bird's gut. Talk about transporting non-native species!
