Longhorn Cowfish

The Longhorn Cowfish, *Lactoria cornuta*, is a truly unique and captivating addition to the marine aquarium. Easily recognized by the prominent, horn-like spines extending forward from its head and backward from its anal region, this fish possesses a boxy, armored body. Its coloration is typically a vibrant yellow to greenish-yellow, often adorned with iridescent blue spots.

A minimum tank size of 125 gallons is recommended for the Longhorn Cowfish due to its potential adult size and need for ample swimming space. Provide plenty of open areas for swimming, along with some rockwork for potential hiding spots, although they are generally not shy. This species is not considered reef-safe as it may nip at corals and invertebrates.

The Longhorn Cowfish is a slow and deliberate swimmer. It is important to note that when stressed or threatened, this fish can release a toxin (ostracitoxin) from its skin, which can be harmful or even fatal to other fish in the aquarium. Therefore, it is best kept in a species-only tank or with very peaceful, non-aggressive tank mates.

In the aquarium, the Longhorn Cowfish will accept a varied diet. Offer a mix of meaty foods such as mysis shrimp, brine shrimp, and chopped seafood. They will also graze on algae and should be offered high-quality marine flake and pellet foods. They can grow up to 18 inches in the wild, but typically reach a more manageable size of around 10-12 inches in a home aquarium. Sexing is difficult, and breeding in captivity is not common.

Quick Facts

• Scientific Name: Lactoria cornuta
• Care Level: Advanced
• Temperament: Peaceful
• Diet: Omnivore
• Reef Compatibility: Not Reef Safe
• Region of Origin: Indo-Pacific
• Maximum Adult Size: 18"
• Recommended Tank Size: 180 gallons