Thornback Cowfish (Lactoria fornasini)

Fish in the family Ostraciidae. Moderate care. Not Reef Safe.

Thornback Cowfish

Quick facts

Scientific nameLactoria fornasini
FamilyOstraciidae
Care levelModerate
Reef safetyNot Reef Safe
TemperamentSemi Aggressive
Dietomnivore
Adult size8 in
Minimum tank size75 gallons
Water parametersTemperature: 72-78°F pH: 8.1-8.3 Salinity: 1.023-1.025
Feeding schedule2-3 times daily

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.

Diet and feeding

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.

Difficulty and care for the Thornback Cowfish

Moderate - Requires some experience due to specific dietary water or tank requirements. Best suited for intermediate aquarists.

Common health issues

Marine ich, Fin rot, Swim bladder disorder, Bacterial septicaemia, Velvet disease

Origin and habitat

Indo-Pacific from the Red Sea to the Great Barrier Reef and beyond, typically found on coral reefs and rocky areas.

Log Thornback Cowfish in your reef tank

Reef Trak gives you the full record on every species in your tank: acquisition date, source, photos, parameters at time of stocking, and links to maintenance and feeding events. Track Thornback Cowfish alongside everything else in your reef.