I actually get in the water hoping and praying I see a shark or something cool like it. Sadly, we almost never, ever see sharks. When we do, they usually speed off in the opposite direction. They are not wild eating machines just waiting for you to step into the water.
Millions of people swim in the ocean, yet there are very few incidents. Of the attacks that do happen, more often than not the bitee put themselves in a precarious situation that initiated the incident.
Out at CC there are nets at the family beach, and CMs watch for possible breaks & predators. It's as safe as the ocean gets.
You have to respect the ocean and it's occupants, but you don't have to fear them.
I know this is hard, but your DH can't let his personal fears influence and possibility instill fear in your child. Especially when, like in this case, there really isn't danger if you use your head and follow directions