Saltwater Fish
Dascyllus trimaculatus
Dascyllus trimaculatus
(Three-Spot Damselfish)

Species Description…

Scientific Name: Dascyllus trimaculatus
Common Name: Three-Spot Damselfish
Species Group: Damselfish
Habitat: Reef Safe
Care Level: Beginner
Temperament: Aggressive
Diet Type: Omnivore
Role in Aquarium: Community Fish
Max Fish Length: 5 (inches)
Min Aquarium Size: 30 (gallons)
Native Range: Indo-Pacific, including the Red Sea, Indonesia, and the Great Barrier Reef
Dascyllus Trimaculatus - The Three-Spot Damselfish

Dascyllus Trimaculatus (The Three-Spot Damselfish)

Overview

  • Native to the Indo-Pacific, frequently found in coral reefs, lagoons, and rocky coastal regions.
  • Recognized by its dark body with a distinctive three-spot pattern during its juvenile stage, which fades as it matures.
  • A hardy species known for its territorial nature, especially as it grows larger.
  • Can form symbiotic relationships with anemones, similar to clownfish, though this is less common.
  • Best suited for aquariums with stable water conditions, live rock structures, and ample swimming space.

Feeding

  • Omnivorous, feeding on plankton, algae, and small invertebrates in the wild.
  • Thrives on a diet of high-quality marine flakes, frozen mysis shrimp, brine shrimp, and algae-based foods.
  • Readily accepts prepared foods but benefits from occasional live or frozen food supplementation.
  • Should be fed multiple times per day to maintain energy levels and promote proper growth.
  • A well-balanced diet enhances coloration and supports a strong immune system.

Habitat

  • Prefers reef-associated environments with moderate to strong water flow.
  • Often found near coral heads, rock crevices, and artificial reef structures.
  • Aquarium setups should include live rock for shelter and open areas for swimming.
  • Requires stable water parameters and high-quality filtration to ensure long-term success.
  • Providing shaded areas and structured environments supports natural schooling behaviors.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C) to maintain health and activity.
  • Preferred pH range: 8.1-8.4, with a salinity level of 1.020-1.025.
  • Requires regular water changes and high-quality filtration to maintain clean water conditions.
  • Reef-safe but may become territorial toward smaller tankmates, particularly in confined spaces.
  • Providing rock formations and coral branches helps reduce aggression by allowing fish to establish territories.

Compatibility

  • Semi-aggressive and best housed with other similarly robust fish.
  • Compatible with clownfish, wrasses, tangs, and other moderately tempered reef species.
  • Should not be housed with timid or slow-moving fish that may become targets of aggression.
  • Best kept in small groups to distribute aggression among their own species.
  • Providing a well-structured environment with sufficient swimming space reduces territorial disputes.

Aquarium Behavior

  • An energetic swimmer that establishes small territories around rock and coral formations.
  • Frequently observed schooling in younger stages but may become more solitary or aggressive as it matures.
  • More confident and less aggressive when given enough space and structured environments.
  • Providing a natural reef-like setup encourages active swimming and natural social behaviors.
  • Over time, it may recognize its caretaker and become more interactive, especially during feeding sessions.