Where can we find mermaids?

If you aren't finding mermaids at dive spots, and you use the Register mod, check and make sure that the mod didn't assign them all to be merchants. I was baffled that I was never seeing any mermaids, and then figured out that the mod had assigned all of them to different jobs in town.. hence they stood there all day at their jobs and never went out diving. ;P

I reassigned the jobs to different townies and now the mermaids are showing up in the dive spots.