Where are the mermaids?

Also walk the beaches. My sim has been in Sulani for about 3 sim weeks now and in the commercial district random shells are spawning right on the beaches. One was an "ordinary conch" and when you blow on it mermaids will gather. I did it and it worked and my sim isn't a mermaid. Prior to that though I did see some just swimming in the lagoon near the public beach access at sunset a few times.