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Longhorn cow

Longhorn cow

Origin

🇦🇺

Australia

🇯🇵

Japan

Indo-Pacific

East Africa

Habitat Size

150-400 Liters

Water Type

Fresh Water

Water Temperature

22º-26ºC

Cost in India

₹200 - ₹300

Size

6 - 12 inches (Medium)

Diet

Omnivore

A yellow longhorn cowfish with blue dots and horns swims over purple tinged live rock
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by Happy Pet TeamUpdated on 29 Oct 2025

Longhorn cowfish’s scientific name is Lactoria cornuta. It has horn-like protrusions above the eyes and tail and is considered to be a highly distinctive marine. The cowfish boasts a box-shaped body, bright yellow to olive base colour, and white or blue spots. It is native to reefs and lagoons across the Indo-Pacific. Longhorn Cowfish requires special care and attention because of the size, diet, and toxin-release risk. It adds colour and vividness to the aquarium.

What is the size of a Longhorn Cowfish?

The Longhorn Cowfish size is anywhere between 45-50 cm (~18-20 inches). It can grow larger or smaller depending on how the care has been taken for.

Longhorn Cowfish Life Expectancy

The Longhorn Cowfish can live anywhere between 6 to 10 years. Its life expectancy can be longer with clean water, proper diet, and low stress.

Is Longhorn Cowfish available for aquariums?

This species is stocked at both online and local aquarium stores, with prices from ₹2,000 to ₹3,500.

Best Compatible With-

  1. Peaceful large fishes
  2. Certain tangs
  3. Large wrasses
  4. Non-aggressive marine species

Avoid Pairing With-

  1. Small or aggressive fish
  2. Snails
  3. Small shrimp
  4. Tubeworms
  5. Other Longhorn Cowfish

Characteristics

Temperament

Aggressive

Friendly

Compatibility with other fishes

Not Friendly

Super Friendly

Habitat Size

Small

Large

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Longhorn Cowfish Habitat

Initial Setup Cost

₹10,000 - ₹30,000

Water Temperature

22º -26ºC

Water Type

Fresh Water

PH Level

8.1 - 8.4

Longhorn cowfish’s a freshwater species that needs to be kept in a healthy and thriving living condition for longevity. Following habitat conditions must be met.

Parameter

Details

Minimum Tank Size

At least 600 litres (~150-160 gallon) for adult size.

Water Temperature

24-28 °C (75-82 °F)

pH Level

Around 8.1-8.4

Substrate / Decor

- Live rock & live sand helpful

- Open swimming space

- Hiding places to reduce stress

- Avoid sharp objects given their boxy body shape.

Essential Equipment

Aquarium tank

Water filter

Heater

Light

Substrate

Decor

Longhorn Cowfish Diet

Avg Monthly Expenses

₹200 - ₹ 300

The cowfish is an omnivore with a mix of meat-based and plant/ algae-based foods.

Food Type

Feeding Frequency / Tips

Meaty Foods

- 2-3 times daily

Vegetable / Algae-based Foods

Include regularly for good balance and digestive health

Treats & Enrichment

Good variation to aid health and natural behavior

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Health & Care for Longhorn Cowfish

Common Health Issues

Fin rot

White spot / ick

Ammonia poisoning

Parasites

Swim bladder inflammation

Bacterial infections

Signs of good health

Active

Bright coloration

Good apetite

Signs of sickness

Loss of appetite

Lethargic behaviour

Dull coloring

Tattered fins

White growths

The cowfish must be taken care of in order to keep their health at peak condition.

  1. Toxin Release: Longhorn Cowfish have skin that contains toxins (ostracitoxin). It secretes when the cowfish is stressed or dying. So, keep an eye out for the health and separate it from the rest if any unnatural behaviour is noticed.
  2. Water Quality: The cowfish is sensitive to poor water. Strong filtration and regular maintenance is required to maintain good health.
  3. Behaviour: They are Slow swimmers. Cowfish get stressed by aggressive water flow, overcrowding, or aggressive tank mates.

Prerequisites for a Fish

Adequate tank space

Effort & commitment

Cleanliness

Enriching Environment

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Written by

Happy Pet Team

Author

Team Happy Pet is a passionate collective of pet experts, enthusiasts, and advocates dedicated to sharing trusted and insightful content.

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Frequently Asked Questions

Can Longhorn Cowfish be kept in reef aquariums?

Yes, but with caution. They may nibble on invertebrates and corals. Many hobbyists keep them in FOWLR (Fish-Only With Live Rock) setups.

How often should I feed my Longhorn Cowfish?

Typically 2-3 times per day in small portions to prevent overfeeding and maintain water quality.

Is Longhorn Cowfish toxic to other fish?

Yes. They can release ostracitoxin when stressed, injured, or dying. This can poison other tank inhabitants. Remove them from the system if they are unwell.

How big a tank do I need if I want a full-grown Longhorn Cowfish?

Something in the range of 600-700 litres (150-180 gallons) or more to accommodate adult size.