Longhorn Cowfish

Longhorn Cowfish 

(Lactoria cornuta)

QUICK STATS

Minimum Tank Size: 125 gallons

Care Level: Difficult

Temperament: Peaceful

Reef Compatible: With Caution

Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.020-1.025

Max. Size: 1' 8"

Color Form: White, Yellow

Venomous: Poisonous When Stressed or Dies

Diet: Omnivore

Origin: Indo-Pacific

Family: Ostraciidae

The Longhorn Cowfish inhabit the reefs of the Indo-Pacific, usually in the less turbid waters. The body is yellow and covered with white dots, and is occasionally referred to as the Yellow Boxfish; however, the Longhorn is not to be confused with Ostracion cubicus, commonly called the Yellow or Polka Dot Boxfish. In the wild, it is not uncommon to see a 20" specimen, while in the aquarium the Longhorn Cowfish tends to be dramatically smaller - 16" or less.

When possible, the Longhorn Cowfish should be the first fish introduced in the tank. It is intolerant of other Longhorns, so keep it in a large tank, with some live rock for algae scraping. Use caution if placing the Cowfish Longhorn in a reef tank as it may nibble on tubeworms. When housed correctly, the Cowfish Longhorn is long-lived.

Similar to other boxfish, the Cowfish Longhorn's skin is poisonous and, when threatened, it will release a toxin lethal to other tank members, including other Longhorns.

Since they are omnivores, the Longhorn Cowfish should be offered a variety of meaty and vegetable foods. They are slow eaters, and should not be housed with aggressive eaters.