
Species GuideBlue-spotted Boxfish
Blue-spotted Boxfish
Ostracion cyanurus
Ostraciidae family · Reef
Least Concerntoxic
A small, brilliantly-coloured boxfish with a rigid bony "box" body structure. Males are bright blue with yellow polka dots; females are brown with white dots. Found on the Gulf of Oman reefs. Releases ostracitoxin from skin when stressed — do not handle.
Species Stats
Max Length
15 cm
Max Weight
0.1 kg
Depth Range
2–30 m
Diet
Sponges, algae, worms, small crustaceans
Habitat
Coral reefs, rocky areas with coral
Local Name (Arabic)
أبو صندوق
Fun Facts
- 1
The box-like body is formed from fused bony plates — no flexibility in the trunk at all.
- 2
When stressed or killed, it releases a toxic mucus (ostracitoxin) that can kill other fish in the same aquarium.
- 3
Propels itself using only the dorsal, anal, and pectoral fins — the tail is only used for bursts of speed.
Research Papers
Found In
FujairahSharjah (east coast)Ras Al Khaimah (east coast)
Quick Info
FamilyOstraciidae
HabitatReef
EdibilityAvoid
CoastGulf of Oman
Dangertoxic
Last reviewed June 2026Sources: MOCCAE, EAD, FAO species profiles