Undulated Trigger

The Undulated Triggerfish (Balistoides undulatus) is a striking and aggressive marine species known for its bold patterns and robust personality. Its fascinating appearance and complex behaviors make it a popular but challenging choice for experienced aquarists.

(REEF SAFE WITH CAUTION / ADVANCED)

Essential Information:

• Common Names: Undulated Triggerfish, Undulated Trigger, Zebra Trigger
• Scientific Name: Balistoides undulatus
• Family: Balistidae
• Origin/Habitat: Native to the Indo-Pacific, typically found in coral reefs, lagoons, and rocky outcrops.
• Maximum Size: Up to 15 inches (38 cm)
• Lifespan: Typically 10–15 years with proper care
• Level of Difficulty: Advanced; requires a large, well-established tank and an experienced aquarist to manage its aggressive behavior.

Appearance & Physical Traits:

• Coloration & Pattern: The Undulated Triggerfish features a bold pattern of yellow and brownish hues, with distinctive undulated lines running across its body. The coloration can change depending on mood and environmental factors.
• Body Shape & Structure: Robust, oval-shaped body with a large, broad head and a pronounced set of teeth. It also has the iconic trigger mechanism on its dorsal fin.

Habitat & Environmental Needs:

• Minimum Tank Size: 100 gallons (379 liters) or larger.
• Water Temperature: Maintain between 74°F and 80°F (23°C to 27°C).
• pH Level: Keep between 8.1 and 8.4.
• Specific Gravity: Optimal range is 1.023 to 1.025.
• Aquascape: Provide plenty of live rock and hiding spots. A sandy substrate is recommended, as it enjoys burrowing into the sand for sleep.

Diet & Feeding:

• Diet Type: Carnivorous
• Preferred Foods: Strong preference for meaty foods, including crustaceans, shrimp, and various types of fish. It may also accept frozen foods, squid, and high-quality pellets.
• Feeding Frequency: Feed 2–3 times daily, offering a variety of foods to ensure nutritional balance.

Behavior & Compatibility:

• Temperament: The Undulated Triggerfish is known for its aggressive and territorial behavior, especially towards other fish. It is not recommended for community tanks with smaller or less aggressive species.
• Social Behavior: Can be solitary or kept with similarly sized, aggressive tank mates. Avoid pairing with other triggerfish or small fish.
• Tank Mate Compatibility: Compatible with large, robust fish that can hold their own. Avoid keeping with invertebrates and small peaceful species.
• Activity Level: Active and bold, often seen darting in and out of crevices and aggressively defending its territory.

Care Considerations & Additional Notes:

• Ease of Care: Requires significant space and stable water conditions. It can be a challenge for aquarists due to its aggressive nature, making it more suited for advanced hobbyists.
• Special Requirements: The Undulated Triggerfish needs a secure tank with no small openings, as it is known to be a jumper and can damage or rearrange tank décor. A sandy substrate is essential for it to burrow.
• Breeding Info: Rarely bred in captivity, and little is known about its reproductive habits.
• Additional Notes: While the Undulated Triggerfish’s aggressive nature can make it a handful, it is also highly intelligent and captivating. It requires a well-maintained tank with stable water parameters and should only be housed with suitable, equally robust tank mates.