In the women's race, Charlotte Webby won her third straight title in a smart time of 31m 57s with just the three fastest male swimmers ahead of her.
"I'm pretty happy. I didn't see too many boys in front of me but I just really wanted to go out there and race," she said.
"I haven't raced in a while so just build some confidence back up.
"I like the Mount. It is a great place to swim and around the islands is pretty exciting. The sea is really clear.
"I am fortunate not to get stuck on the rocks yet and obviously if I swam into them I would have a different story, but I have been pretty lucky."