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In late September, the 18,000-square-foot space was sparsely populated with three rays, a cluster of silvery goatfish and multiple tanks of coral.

Only nine species of fish, including the goldsaddle goatfish, are known to hunt in this fashion.

But it’s more difficult to understand teamwork between cleaner shrimp and, say, goatfish, which Dr. Caves said are known to “gobble crustaceans.”

Cowfish and goatfish grazed here and there, as a small, curious barracuda patrolled in the distance.

All goatfish need to be at least 12 inches.