BIG-EYE TREVALLY (Caranx sexfasciatus)
Length: to 1 m
A very common species in our area, often in great schools at the Similan Islands.
Small juveniles are marked with dark cross bars. Large adults are found singly or in schools along deep drop-offs.
HARLEQUIN SWEETLIPS (Plectorhinchus chaetodontoides)
Length: to 60 cm
Large juveniles and adults may share large ledges and caves along drop-offs. Small juveniles are found in protected bays and lagoons.
Dramatic changes from juvenile, brown with large white patches, to intermediates with large black spots.
The spots reduce in size with age and large adults have small spots over most of the body and head.
ROUND BATFISH (Platax orbicularis)
Length: to 60 cm
Widespread throughout our area from surface to 40 m.
Smalljuveniles float against the surface with current or wind-driven land debris. They settle in lagoons or along beaches on sand in small schools.
Adults pair or school in different areas and are usually found in deeper off shore areas.
RED-TAILED BUTTERFLYFISH (Chaetodon collare)
Length: to 14 cm
Inhabits outer reef slopes and rocky shores, also found in coral-rich areas. Feeds mainly on coral polyps and worms.
In pairs, also often in schools of up to 25 individuals. Not shy towards divers.
SCHOOLING BANNERFISH (Heniochus diphreutes)
Length: to 20 cm
This widespread species is found in sometimes large aggregations in the water column high above reef tops, feeding on zooplankton.
Juveniles live a more bottom-oriented existence, while adults spend all day in open water, where they are protected by swimming in a school.
RING ANGELFISH (Pomacanthus annularis)
Length: to 50 cm
Large, impressive Angelfish, which prefers murky, nutrious-rich habitats. Feeds on zooplankton and sponges. Adults are found mostly in pairs in depths of 20 m or more.
BLUE-BARRED PARROTFISH (Scarus ghobban)
Length: to 80 cm
One of the largest in the family. Common in various habitats, also deep, penetrating silty environments more readily than other parrot fishes. The dental plates are pale pink. We see them often at our Similan Liveaboard cruises.
POWDER-BLUE SURGEONFISH (Acanthurus leucosternon)
Length: to 25 cm
Typical surgeonfish, found from inshore surge zones to offshore reef flats like the Similans and slopes.
Snorkeler can also enjoy the whirling blue fish in a depth of only one meter at some places.
LINED SURGEONFISH (Acanthurus lineatus)
Length: to 35 cm
Widespread species, usually found in very shallow depths, schooling over reef crests, rarely deeper than 6 m.
An easily identified species by its color pattern. Large males are territorial and control well-defined feeding territories and harems in the surge zone.