Threebar Porcupinefish (Dicotylichthys punctulatus) lives in coastal reef across eastern Australia. It feeds on hard-shelled invertebrates.
Fascinating facts about the Threebar Porcupinefish
- A fish that can puff up to a spiky ball lives only along Australia’s east coast, from Moreton Bay down to Bass Strait, making it a true regional exclusive. Its limited range shows how isolated reef ecosystems can foster one-of-a-kind lineages.
- While the biggest recorded individuals reach 43 cm (17 in) in length, most three-bar porcupinefish are just 18 cm (7.1 in) long – about the size of a school notebook. This size gap hints at strong growth constraints in their reef habitats.
- Diving no deeper than 50 m (160 ft), these fish patrol estuarine, coastal and offshore reefs, preferring the dim light of night. Their shallow-water niche keeps them within reach of divers who can spot them after sundown.
- Unlike many reef fish that hunt in schools, this species roams alone and hunts at night, cracking hard-shelled invertebrates.
- The three-bar porcupinefish is the sole survivor of its genus, Dicotylichthys, making it a living textbook of evolutionary isolation. Its lone status underscores the fragility of specialized lineages that exist nowhere else on Earth.
At a glance
Rangeeastern Australia
Habitatcoastal reef
Diethard-shelled invertebrates
About the Threebar Porcupinefish
The three-bar porcupinefish, Dicotylichthys punctulatus, is found along Australia’s eastern coast. It grows to about 43 cm (17 in) in length, though most individuals are around 18 cm (7.1 in). It is solitary and nocturnal, inhabiting estuarine, coastal and offshore reef habitats down to 50 m (160 ft) and feeds on hard-shelled invertebrates.
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