I just found a few vids on Youtube that are really good and tell how clams are farmed. Check em out!
[video=youtube;bLQHqamR-UA]http://www.youtube.com/watch?v=bLQHqamR-UA&feature=related[/video]
[video=youtube;bLQHqamR-UA]http://www.youtube.com/watch?v=bLQHqamR-UA&feature=related[/video]