This Nassau grouper is waiting patiently while a group of Pedersen's cleaner shrimp eat parasites. This is a commensal relationship: the shrimp get fed, and the Grouper gets to be healthier. Sometimes you can see another fish waiting for a turn at the cleaning station.

Nikon F4, 200mm Nikkor f/4 Macro lens, Aquatica Housing, 2 Ikelite AI/n strobes, f/11, Kodak Royal Gold 100.

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