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Thornback Cowfish (Lactoria fornasini)

Find Thornback Cowfish across reef-livestock retailers on ReefDock. Compare sources, check known pricing where available, and review care information before you buy.

Thornback Cowfish
Photo: victorius eps · CC BY-SA 4.0
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Where to buy Thornback Cowfish

ReefDock searches the following reef retailers for this fish. Click through to see the live price.

  • Saltwaterfish

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    Search Saltwaterfish
  • Amazon

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    Search Amazon
  • Petco

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    Search Petco

About Thornback Cowfish

The Thornback Cowfish displays a pale yellow to tan body with a distinctive box-like, cuboid shape reinforced by bony plates. It is characterized by horn-like protrusions (spines) above each eye and at the rear corners of the body, giving it a "thorny" appearance.

Key facts

Difficulty Level
Moderate - Requires some experience due to specific dietary water or tank requirements. Best suited for intermediate aquarists.
Reef safety
Not Reef Safe
Diet Details
Feed a varied diet of high-quality pellets, mysis shrimp, small crustaceans, and occasional vegetable matter. Offer food 2–3 times daily in small portions, as overeating can cause bloating and related health issues.
Care Level
Moderate
Diet
omnivore
Temperament
Semi Aggressive
Care Requirements
• 75+ gallon tank minimum; poor swimmers requiring ample space • Stable water params: 72-78°F, SG 1.020-1.025, pH 8.1-8.3 • Strong filtration and moderate flow; cowfish are toxic when stressed • Feed varied omnivorous diet: frozen foods, algae, sponges • Avoid aggressive tankmates; generally incompatible with corals and inverts
Common Health Issues
Marine ich, Fin rot, Swim bladder disorder, Bacterial septicaemia, Velvet disease
Origin
Indo-Pacific from the Red Sea to the Great Barrier Reef and beyond, typically found on coral reefs and rocky areas.
Appearance
The Thornback Cowfish displays a pale yellow to tan body with a distinctive box-like, cuboid shape reinforced by bony plates. It is characterized by horn-like protrusions (spines) above each eye and at the rear corners of the body, giving it a "thorny" appearance.
Feeding Schedule
2-3 times daily
Max Size
8

Research before you buy

ReefDock is the sister app to Reef Trak. Use Reef Trak to research and log fish, keep tank parameters organized, and maintain a complete livestock history. Log this fish on Reef Trak.

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