Great Barrier Reef Fish
I photographed most of the species below at the Cairns Aquarium in preparation for our Great Barrer Reef trip but added some I saw on the reef. Tentative ID based on Allen, Steene, Humann, and Deloach (2015), Reef Pyramid Butterflyfish Fish Identification: Tropical Pacific. (Hemitaurichthys polylepis)
Butterflyfish & Anglefish Three-spot Angelfish (Apolemichthus trimaculatus)
Longfin Bannerfish Dot & Dash Butterflyfish (Heniochus acuminatus) (Chaetodon pelewensis)
Longfin Spadefish (Platax teira)
Surgeonfish & Rabbitfish
Longnose Butterflyfish Blacklip Butterflyfish (Forcipiger flavissimus) (Chaetodon kleinii)
Anglefish & Spadefish
Orange-band Surgeonfish (Acanthurus olivacaus)
Threadfin Butterflyfish Queensland Yellowtail Angelfish (Chaetodon auriga) [Wikipedia] (Chaetodontoplus meredithi)
Whitecheek Surgeonfish (Acanthurus nigricans)
Black-spot Angelfish (Genicanthus melanospilos) Teardrop Butterflyfish (Chaetodon unimaculatus) [Wikipedia] Damselfish & Anemonefish
Brown Surgeonfish Bluespine Unicornfish (Acanthrurus nigrofuscus) (Naso unicornus)
Sissortail Sergeant (Abudeful sexfasciatus)
Pallette Surgeonfish Humpback Unicornfish Paracanthurus hepatus) (Naso brachycentron)
Golden Damsel (Amblyglyphidodon aureus)
Coral Rabbitfish (Siganus corallinus) Pacific Sailfin Tang (Xebrasoma vlifer)
Barrier Reef Anemonefish (Amphiprion akindynos)
Orangespine Unicornfish Masked Rabbitfish (Siganus puellus) (Naso lituratus)
Paletail Unicornfish (Naso brevirostris) Foxfaced Rabbitfish (Siganus vulpinus) Clown Anemonefish (Amphiprion pwercula)
Humpnosed Unicornfish (Naso hexacanthus)
Humbug Dascyllus (Dascyllus aruanus) Coral Rabbitfish (Siganus corallinus)
Blue-axil Chromis (Chromis atripectoralis) Bridled Monocle Bream (Scolopsis bilineata)
Snappers & Bream Topsail Chub Silvery Group (Kyphosus cinerascens [Wikimedia]
Groupers, Hawkfish, Sweetlips
Spanish Flag Snapper (Lutjanus carponotatus) Giant Trevally (Caranx ignoblis)
Blacksaddle Grouper (Epinephelus howlandi)
Sailfin Snapper (Symphorichthys spilurus)
Golden Trevally (Gnathanodon specious)
Camouflage Grouper (Epinephelus polyphekadion)
Midnight Snapper juvenile (Macolor macularis) (Reef App) Bluefin Trevally (Caranx melampygus)
Blacksaddle Coral Grouper (Plectropomus laevis)
Humpback Snapper (Lutjanus gibbus)
Silver Mono (Monodactylus argenteus)
Giant Sweetlips (Plectorhinchus albovittatus) ?
Striped Large-eyed Bream (Gnathodnetex aureolineatus)
Many-spotted Sweetlips Anthias sp. (Plectorhinchus chaetodonoides) Wrasse
Wrasse sp.
Triggerfish & Puffers
Diagonal-banded Sweetlips Bluestreak Cleaner Wrasse (Plectorhinchus lineatus) (Labroides dimidiatus) [Wikipedia]
Clownfish Triggerfish Balistoides conspicillum)
Sunset Wrasse (Thalassoma lutescens)
Dwarf Hawkfish (Cirrhichthys falco)
Fusilier & Anthias
Redtooth Triggerfish (Odonus niger) Pacific Bird Wrasse (Gomphosus various)
Yellow-tail Fusilier (Caesio cuning)
Blackspotted Puffer (Arothron nigropunctatus)
Yellowface Wrasse (Halichoeres solorensis)
Twospot Anthias (Psuedoanthias bimacluatus)
Humphead Wrasse (Chelinus undulatus)
White-spotted Puffer Arothron hispidus) Moray Eels
Whitetail Stingray (Himantura granulata)
Other
Yellowmargin Moray (Gymnothorax flavimarginatus) Spotted Seahorse (Hippocampus kuda)
Bumphead Parrotfish (Bolbometopon muricatum) [GBR Library]
Olive Sea Snake (Aipysurus laevis)
Sharks & Rays
Yellow-tail Flagblenny Gray Reef Shark (Melacanthus atrodorsalis) (Carcharhinus amblyrhynchos) ?
Black-tipped Shark (Carcharhinus melanopterus) Reef Stonefish (Synanceia vwerrucosa)
Red Lionfish (Pterois volitans)
Zebra Shark (Stegostoma fasciatum)