Longhorn Cowfish
Lactoria cornuta
Saltwater Fish
Species Group: Boxfish
Family: Ostraciidae
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Water parameters
Temp
76-80 F
Temperature
Maintaining a stable and appropriate temperature is critical for the survival of aquatic life.
pH 7.8 - 8.4 potential of HydrogenMeasuring the acidity or alkalinity of water on a 0–14 scale, where 7 is neutral, 7 is alkaline.
NO3 1-20 ppm NitrateWhile less toxic than ammonia, high nitrate levels (above 40–80 ppm) are important to monitor because they can cause fish stress, stunted growth, and harmful algae blooms.
NO2 <0.0001 ppm NitriteIt is a highly toxic, intermediate compound in the nitrogen cycle produced from broken-down ammonia
PO4 0.01 - 0.1 ppm PhosphateIt is essential for plant development but must be managed, as excess levels trigger nuisance algae blooms and inhibit coral calcification.
NH3 <0.1 ppm AmmoniaIt is the primary killer of aquarium fish, causing gill damage, stress, and death
Ca 380 - 450 ppm CalciumSupporting the growth, skeletal structure, and shell formation of corals, mollusks, crustaceans, and coralline algae
KH 8 - 12 dKH AlkalinityIt acts as a shield, neutralizing acids to prevent dangerous pH "crashes" that can harm fish, corals, and plants.
Mg 1200 - 1400 ppm MagnesiumIt enables coral growth by supporting skeletal formation, assists in metabolic processes, and ensures that calcium is available for corals, clams, and coralline algae.
SG 1.023 - 1.026 SG SalinityEssential for maintaining stable, natural water parameters, proper osmoregulation, and stress-free environments for marine fish and corals
ORP 250 - 400 mV Oxidation-Reduction PotentialA higher positive mV indicates clean, oxygen-rich water with high water quality, while low readings indicate high pollution.
About Longhorn Cowfish
General information
The Longhorn Cowfish, scientific name Lactoria cornuta, is a unique-looking species that has a box-shaped body with bony plates that provide protection against predators. They have two long horns on the forehead that give them their name. They grow up to 18 inches (45 cm) in length, but in an aquarium, they usually reach around 12 inches (30 cm) in length. This species requires a large aquarium with plenty of hiding places, as they can be aggressive and territorial with other fish.
Diet & nutrition
In the wild, Longhorn Cowfish feed on a variety of algae, small crustaceans, and worms. In an aquarium, they should be fed a varied diet that includes marine algae, brine shrimp, mysis shrimp, and other small meaty foods. They may also benefit from the occasional feeding of live food.
Determining sex
There are no visible differences between males and females.
Breeding & spawning
Breeding Longhorn Cowfish in an aquarium is challenging and has not been reported often. They are egg layers and the eggs are sticky, attaching to surfaces in the aquarium.
Diseases
Longhorn Cowfish are generally hardy, but like all fish, they can be susceptible to diseases like bacterial infections, parasites, and fungal infections. Maintaining good water quality and a healthy diet can help prevent these diseases.
Origination
Longhorn Cowfish are found in the Indo-Pacific region, including the Red Sea, East Africa, and the Hawaiian Islands.
Cautions
Longhorn Cowfish have a potent toxin in their skin and organs that can be harmful to other fish in the aquarium. They can also release this toxin into the water if stressed, injured, or killed. This toxin can be deadly to other fish and invertebrates in the aquarium.
Acclimation process
When introducing Longhorn Cowfish to a new aquarium, it is important to acclimate them slowly. This can be done by floating the bag containing the fish in the aquarium for 15-20 minutes, then adding a small amount of aquarium water to the bag every 5-10 minutes. This will allow the fish to slowly adjust to the new water chemistry and temperature.
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