Schooling bannerfish (Kristina Vackova /

Bannerfish (Heniochus sp.) are a subgroup of the butterflyfish family. They typically have black-and-white banded bodies and yellow caudal and dorsal fins. The longfin bannerfish can reach a maximum length of about 25 centimeters (10 inches). Bannerfish feed on zooplankton, coral polyps, or bottom-dwelling invertebrates.

Inhabits the Indo-Pacific Ocean.

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