Spadefish (Batfish)

Longfin spadefish (Jeremy Brown / shutterstock.com)

Spadefish (Ephippidae, also known as batfish) are characterized by disk-shaped, compressed bodies and typically one or two dark, vertical bars running across the front part of their flanks. The dorsal, anal, and ventral fins of juvenile fish are greatly elongated. The longfin spadefish (Platax teira) can reach 41 centimeters (16.1 inches) in length.

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