I visited a farm in British Columbia about ten years ago that was raising bivalves (geoducks I think) and they'd worked out how to raise them all the way from f

I visited a farm in British Columbia about ten years ago that was raising bivalves (geoducks I think) and they'd worked out how to raise them all the way from fertilization through all the microscopic stages. In retrospect, they probably had to do that because clams aren't polite enough to attach to something, en masse, that you can collect on the beach.