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.
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)

Reticulate boxfish
(Ostracion solorensis)

Scrawled cowfish
(Acanthostracion quadricornis)

Smooth trunkfish
(Rhinesomus triqueter)

Spotted boxfish
(Ostracion meleagris)

Spotted trunkfish
(Lactophrys bicaudalis)

Yellow boxfish
(Ostracion cubicus)
Discover also

Azure damselfish
(Chrysiptera hemicyanea)

Humbug damselfish
(Dascyllus aruanus)

Leopard flounder
(Bothus pantherinus)

Mural goby
(Valenciennea muralis)

Pacific Diana's pigfish
(Bodianus dictynna)

Splendid toadfish
(Sanopus splendidus)

Tail-spot wrasse
(Halichoeres melanurus)

Tessellated blenny
(Hypsoblennius invemar)
The marine species from Indo-Pacific

Bigeye trevally
(Caranx sexfasciatus)

Blue tunicate
(Rhopalaea fusca)

Blueface angelfish
(Pomacanthus xanthometopon)

Copperbanded butterfly
(Chelmon rostratus)

Emperor angelfish
(Pomacanthus imperator)

Lemonpeel angelfish
(Centropyge flavissima)

Pearl-scaled angelfish
(Centropyge vrolikii)
Our latestUpdates

Monday, March 2nd 2026
The blueface angelfish
The blueface angelfish is a very colorful fish of the tropical coral reefs of the Indo-Pacific, recognizable by its bright blue head and its bluish body finely reticulated with yellow.

Wednesday, February 18th 2026
The Atlantic tarpon
The Atlantic tarpon is a large coastal fish that can grow up to 8 feet long and weigh over 330 pounds, with a silvery body covered in large, reflective scales. Known as the Silver King, it is famous for its spectacular leaps and fierce fight when hooked by sport fishermen.

Friday, January 30th 2026
The dugong
Discover the dugong, a gentle “sea cow” of tropical waters. Learn about its habitat, diet, reproduction, morphology, and the threats facing this unique marine mammal.
Photo of the Day

Requin pointe blanche océanique
(Carcharhinus longimanus)