Fish ID: Moorish Idol

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Family Moorish Idol (ZANCLIDAE)
species Zanclus cornutus
size Up to 20cm
locality Shallow to outer reefs
behaviour Often in pairs, occasionally in groups
range Circumglobal in tropical zone

This is Fish ID 101: easily recognised by its long white banner-like dorsal fin filament. Body is almost circular, though with a clear snout. (Not to be confused with Bannerfish which are more truncate and triangular). Plays ‘Gill’ – the main aquarium protagonist – in ‘Finding Nemo’ movie.