Yellowback Fusilier (Caesio xanthonota)
Observed: Koh Chang Reefs, December 2015
Observed By: BB Divers
The yellowback fusilier is a small fish with a pale body and a distinctive bright yellow zone on its back. They swarm in large numbers and are a common sight around Koh Chang reefs and lagoons and all over the Indian and Western Pacific Oceans.
They feed on zooplankton and are therefore planktivores, not quite vegetarians, but close.