Sealife guideThe thornback cowfishLactoria fornasini

Last updated on 09/18/2024 at 10:37 PM
Taxonomy
Description
The thornback cowfish has a box-shaped body that resembles a chest. It is distinguished by its long spines located on its head above its eyes, as well as on the dorsal and posterior parts of its body.
A thornback cowfish hiding in the sea grass with its patterned skin and boxy body
A thornback cowfish hiding in the sea grass with its patterned skin and boxy body ©  | Dreamstime.com
The thornback cowfish displays a yellowish to greenish coloration with irregular patterns of bluish or brown spots and lines across its body.
Geographic range
The thornback cowfish is found throughout the tropical Indo-Pacific, especially in the Bali sea, from east Africa to the Bass islands.
Habitat
The thornback cowfish lives in coral reefs and seagrass beds, where it easily hides thanks to its patterns
Did you know ?
The thornback cowfish is a poisonous species of boxfish. Indeed, when stressed or threatened, it secretes toxins as a means of defense against predators
Unlike other fish, the boxfish’s body is covered with a rigid shell made of bony plates, which protects it like armor from predators but also limits its body movements. As a result, the boxfish moves more slowly by undulating its dorsal and anal fins.
Within the same family
Honeycomb cowfish (Acanthostracion polygonium)
Honeycomb cowfish
(Acanthostracion polygonium)
Reticulate boxfish (Ostracion solorensis)
Reticulate boxfish
(Ostracion solorensis)
Scrawled cowfish (Acanthostracion quadricornis)
Scrawled cowfish
(Acanthostracion quadricornis)
Smooth trunkfish (Rhinesomus triqueter)
Smooth trunkfish
(Rhinesomus triqueter)
Spotted boxfish (Ostracion meleagris)
Spotted boxfish
(Ostracion meleagris)
Spotted trunkfish (Lactophrys bicaudalis)
Spotted trunkfish
(Lactophrys bicaudalis)
Yellow boxfish (Ostracion cubicus)
Yellow boxfish
(Ostracion cubicus)
Discover also
African coris (Coris cuvieri)
African coris
(Coris cuvieri)
Flying gurnard (Dactylopterus volitans)
Flying gurnard
(Dactylopterus volitans)
French grunt (Haemulon flavolineatum)
French grunt
(Haemulon flavolineatum)
Longfin batfish (Platax teira)
Longfin batfish
(Platax teira)
Map puffer (Arothron mappa)
Map puffer
(Arothron mappa)
Shortfin lionfish (Dendrochirus brachypterus)
Shortfin lionfish
(Dendrochirus brachypterus)
Whip coral goby (Bryaninops yongei)
Whip coral goby
(Bryaninops yongei)
Wide-eyed flounder (Bothus podas)
Wide-eyed flounder
(Bothus podas)
The marine species from Indo-Pacific
Bicolor angelfish (Centropyge bicolor)
Bicolor angelfish
(Centropyge bicolor)
Bigeye trevally (Caranx sexfasciatus)
Bigeye trevally
(Caranx sexfasciatus)
Blue tunicate (Rhopalaea fusca)
Blue tunicate
(Rhopalaea fusca)
Blueface angelfish (Pomacanthus xanthometopon)
Blueface angelfish
(Pomacanthus xanthometopon)
Bobbitt worm (Eunice aphroditois)
Bobbitt worm
(Eunice aphroditois)
Copperbanded butterfly (Chelmon rostratus)
Copperbanded butterfly
(Chelmon rostratus)
Lemonpeel angelfish (Centropyge flavissima)
Lemonpeel angelfish
(Centropyge flavissima)
Thornback cowfish (Lactoria fornasini)
Thornback cowfish
(Lactoria fornasini)

Our latestUpdates

Faroe islands
Thursday, May 7th 2026
Faroe islands
Discover the Faroe islands, a remote archipelago between Iceland and Norway known for its dramatic cliffs, colorful villages, and untouched Nordic landscapes. Find travel tips, itineraries, hiking guides, local culture, and inspiration to explore this unique destination in the North Atlantic.
The short-finned pilot whale
Wednesday, May 6th 2026
The short-finned pilot whale
Discover the tropical pilot whale (Globicephala macrorhynchus), a highly social large cetacean from tropical and subtropical waters, specialized in deep dives in search of squid.
Where to see groupers in the Mediterranean ?
Thursday, April 23rd 2026
Where to see groupers in the Mediterranean ?
Discover where to see groupers in the Mediterranean: the best diving spots and protected marine areas to observe this iconic fish in its natural habitat.
Photo of the Day
Tortue de mer de Kemp (Lepidochelys kempii)
Tortue de mer de Kemp
(Lepidochelys kempii)