Saltwater Fish
Blackeye Thicklip Wrasse

Species Description…

Scientific Name: Hemigymnus melapterus
Common Name: Blackeye Thicklip Wrasse
Species Group: Wrasses
Habitat: Reef Safe with Caution
Care Level: Intermediate
Temperament: Semi-aggressive
Diet Type: Carnivore
Role in Aquarium: Predator
Max Fish Length: 20 (inches)
Min Aquarium Size: 180 (gallons)
Native Range: Indo-Pacific
Hemigymnus melapterus - Blackeye Thicklip Wrasse

Hemigymnus melapterus (Blackeye Thicklip Wrasse)

Overview

  • Native to the Indo-Pacific region, commonly found in coral reefs, sandy lagoons, and seagrass beds.
  • Recognized for its distinct color pattern, which varies with age: juveniles display a bright yellow and black pattern, while adults develop a more muted brownish-green coloration.
  • A large and powerful wrasse, capable of reaching up to 20 inches (50 cm) in length.
  • Active forager, constantly exploring the substrate for hidden prey.
  • Can be an effective cleaner fish in the wild, removing parasites from larger reef species.

Feeding

  • Carnivorous diet, primarily feeding on small crustaceans, mollusks, and echinoderms.
  • Readily accepts frozen and live foods such as shrimp, squid, and marine worms.
  • Can be trained to eat high-quality marine pellets and flake foods, but benefits from a varied diet.
  • Requires multiple feedings per day to support its high energy levels and rapid growth.
  • Frequently hunts by overturning small rocks and stirring up sand to uncover hidden prey.

Habitat

  • Commonly found in shallow coastal reefs and sandy seabeds with scattered rock formations.
  • Requires an aquarium with ample swimming space and a soft sand substrate for natural foraging behavior.
  • Best suited for tanks with live rock, allowing it to establish territory and shelter.
  • Moderate to strong water flow is ideal to mimic natural reef conditions.
  • A minimum tank size of 180 gallons is recommended due to its large size and active nature.

Fish Care

  • Optimal water temperature: 74-80°F (23-27°C).
  • Ideal pH range: 8.1-8.4, with a specific gravity of 1.023-1.026.
  • Requires stable water parameters and consistent tank maintenance.
  • Can be aggressive toward smaller fish, especially as it matures.
  • Regular sandbed maintenance is necessary, as it frequently disturbs the substrate while foraging.

Compatibility

  • Semi-aggressive and best suited for tanks with similarly sized or larger fish.
  • Compatible with larger tangs, triggers, groupers, and other robust reef fish.
  • Should not be housed with small ornamental shrimp, snails, or delicate invertebrates, as it may consume them.
  • May show territorial behavior towards other wrasses of similar size.
  • Best kept in a well-structured aquarium where it has ample space to establish its own territory.

Aquarium Behavior

  • Highly active swimmer, constantly foraging and exploring its surroundings.
  • Frequently seen overturning small rocks and stirring up sand in search of food.
  • Can display aggressive tendencies if housed with smaller, more timid fish.
  • Juveniles exhibit a cleaner fish behavior, though this diminishes with age.
  • Thrives in a spacious, well-maintained reef tank with adequate hiding spots and room to roam.