Leopard flounder (Silke Baron / CC BY)

Flatfish (Pleuronectiformes) are a group of demersal fish with asymmetric bodies. In the course of their development, one eye migrates to the other side of the head. Flatfish lie on their eyeless side buried in sandy substrate, waiting for potential prey. The order of flatfish includes flounders, soles, halibut, turbot, and other groups known as food fish. The Atlantic halibut (Hippglossus hippoglossus) is the largest known species. It can reach a total body length of up to 4.7 meters (15.4 feet).

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This supplemental online resource accompanies the book Scuba Diving Hand Signals by Lars Behnke, available on Amazon.