Saltwater Aquarium Guide: Rectangular Trigger (Rhinecanthus rectangulus)

Quick Stats:

• Care Level: Moderate
• Temperament: Aggressive
• Diet: Carnivore
• Reef Safe: No
• Minimum Tank Size: 75 gallons
• Max Size: 12 inches
• Water Parameters: pH 8.1-8.4, salinity 1.020-1.025, temperature 72-78°F

Comprehensive Guide: Rectangular Trigger (Rhinecanthus rectangulus)

Habitat:

The Rectangular Trigger, also known as the Humuhumu Triggerfish, is native to the tropical waters of the Pacific Ocean. It can be found around coral reefs and rocky areas.

Reef Safe:

The Rectangular Trigger is not considered reef safe. It may nip at corals, invertebrates, and even smaller fish in the aquarium.

Size:

The Rectangular Trigger can grow up to 12 inches long.

Temperament:

This species is known for its aggressive behavior. It may become territorial and not tolerate other fish of similar size or appearance.

Sexual Dimorphism:

There are no distinct visual differences between males and females of this species.

Lifespan:

The average lifespan of a Rectangular Trigger is around 5 to 8 years, but with proper care, it can live longer.

Diet in Aquariums:

The Rectangular Trigger is a carnivorous fish that feeds on various meaty foods. The aquarium should offer a diet consisting of high-quality frozen and live foods such as shrimp, squid, and fish flesh. It is important to provide a varied diet to ensure proper nutrition.

Aquascaping Recommendations:

When setting up the aquarium for a Rectangular Trigger, it is recommended to provide plenty of hiding places and caves. This will help create a sense of security for the fish and reduce aggression. Use live rock to create natural hiding spots and provide ample swimming space.

Captive Bred Availability:

The Rectangular Trigger is not commonly available as captive-bred. Most specimens in the aquarium trade are wild-caught.

Compatibility with Other Fish, Invertebrates, or Corals:

Due to its aggressive nature, the Rectangular Trigger should be kept with caution. It may not tolerate other fish of similar size or appearance. It is not recommended to keep it with invertebrates or corals, as it may nip at them.

5 Recommended Tankmates:

1. Clownfish: Clownfish are a good choice as they are generally peaceful and can tolerate the aggressive behavior of the Rectangular Trigger.
2. Gobies: Gobies are small, peaceful fish that can coexist with the Rectangular Trigger without issues.
3. Tangs: Tangs are fast swimmers and can avoid the aggression of the Rectangular Trigger. However, ensure you have a large enough tank to accommodate both species.
4. Wrasses: Some species of wrasses can be compatible with the Rectangular Trigger. Choose peaceful wrasses that won’t compete for territory.
5. Damsels: Damsels are hardy fish that can withstand the aggression of the Rectangular Trigger. However, monitor their behavior and provide ample hiding spots.

Other Common Names:

The Rectangular Trigger is also known as the Humuhumu Triggerfish, Picasso Triggerfish, or Rectangular Triggerfish.

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Frequently Asked Questions about the Rectangular Trigger (Rhinecanthus rectangulus)

1. What is the recommended tank size for a Rectangular Trigger?

A minimum tank size of 75 gallons is recommended for a Rectangular Trigger to provide enough swimming space and territory.

2. Can the Rectangular Trigger be kept in a reef tank?

No, the Rectangular Trigger is not considered reef-safe as it may nip at corals and invertebrates.

3. How often should I feed my Rectangular Trigger?

Feed your Rectangular Trigger 1-2 times a day, offering a varied diet of high-quality frozen and live foods.

4. Can the Rectangular Trigger be kept with other aggressive fish?

Keeping the Rectangular Trigger with other aggressive fish is generally not recommended as it may lead to territorial disputes and aggression.

5. What is the lifespan of a Rectangular Trigger?

The average lifespan of a Rectangular Trigger is around 5 to 8 years, but with proper care, it can live longer.