Fish ID: Gunther’s Butterflyfish

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Family Butterflyfish (CHAETODONTIDAE)
species Chaetodon guentheri
size Up to 14 cm
locality Prefers sponge habitat to reef
behaviour Doesn't cling to the reef like smaller Butterflyfish
range East coast Australian waters

Distinctive black ‘dot matrix’ pattern over a silver body, and golden coloured rear end.  (No to be confused with the Citron which has a similar pattern, but more uniformly yellow rather than silver and gold).