Communication and Perception
When mating, males change colors and exhibit a shimmering movement to attract females. In defense or aggression, yellow tangs extend their fins to full length, greatly increasing their size. They also expose their scalpel-like scales on their fins as a warning sign. They use these not only to defend themselves from predators, but also to scare away competitors for food or territory.
Communication Channels: visual ; tactile
Perception Channels: visual