Key Information
• Small fish safe: ✅ Yes
• Small invert safe: ✅ Yes
• Coral safe: ✅ Yes
• Minimum tank size: 265 liters (70 gallons) for a single specimen; larger for groups
• Adult size: Up to 7 cm (2.8 inches)
• Diet: Carnivorous (zooplankton, enriched frozen mysis/brine shrimp, high-quality flake foods)
• Be aware of: Requires frequent feedings due to high metabolism. Best kept in harems (one male with multiple females). May be shy initially; provide ample hiding spots. Known to jump; ensure a secure lid. Avoid housing with aggressive tankmates.
The Ventralis Anthias (Pseudanthias ventralis), also known as the Longfin Anthias or Longfin Basslet, is a captivating marine fish admired for its vibrant colors and graceful presence. Originating from the Western Pacific Ocean, this species is a sought-after addition for experienced aquarists aiming to enhance the visual appeal of their reef aquariums.
Appearance and Coloration
Ventralis Anthias exhibit distinct sexual dimorphism, with males and females displaying different color patterns:
• Males: Display a metallic purple body with a predominantly yellow head. The back, just below the dorsal fin, may have a yellow tinge or be adorned with heavy purple spotting. The dorsal fin is red on the spiny part and hyaline or yellowish on the soft-rayed part. The caudal fin is mostly clear, marked by two vertical purple lines.
• Females: Similar metallic purple coloration as males but lack the same markings. They possess a yellow dorsal fin that extends onto a small area of the back up to the caudal peduncle, separated from the purple body by a red arched stripe near the tail.
This striking coloration makes the Ventralis Anthias a visually appealing species in marine aquariums.
Natural Habitat and Behavior
In the wild, Ventralis Anthias are found in the Western Pacific, inhabiting:
• Deep reef slopes: Typically at depths ranging from 26 to 70 meters (85 to 230 feet), often near caves and crevices that provide quick hiding places.
• Social Structure: They form harems consisting of one dominant male and multiple females. If the dominant male perishes, the largest female will often morph to take its place.
In captivity, they thrive in well-structured aquariums with ample hiding spots and open swimming areas.
Tank Requirements and Water Parameters
To ensure the well-being of Ventralis Anthias in captivity:
• Minimum Tank Size: A 70-gallon (265 liters) tank is suitable for a single specimen. For groups, a 180-gallon (680 liters) or larger aquarium is recommended.
• Water Parameters:
• Temperature: 72°F – 78°F (22°C – 25.5°C)
• pH: 8.1 – 8.4
• Specific Gravity: 1.020 – 1.025
• Aquascaping: Provide ample live rock formations to create hiding spots and territories, while ensuring open swimming spaces.
• Lighting: Standard reef aquarium lighting is sufficient.
• Water Movement: Moderate to strong, simulating their natural reef environment.
Maintaining stable water conditions is crucial for their health.
Diet and Feeding
Ventralis Anthias have a high metabolism and require frequent feedings:
• Diet: Primarily carnivorous, feeding on zooplankton in the wild. In captivity, offer:
• Enriched frozen mysis shrimp
• Enriched frozen brine shrimp
• High-quality flake foods
• Live foods (e.g., copepods, amphipods) can be beneficial, especially during acclimation.
• Feeding Frequency: Due to their constant activity and high metabolisms, they should be fed small amounts several times per day (at least three times daily) to maintain good health.
An attached refugium cultivating copepods and amphipods provides a steady supply of nutritious live food, which can be beneficial for this active planktivore.
Compatibility and Social Structure
Ventralis Anthias are social fish that thrive in groups:
• Social Structure: Best kept in harems consisting of one male and multiple females. Avoid keeping multiple males in the same tank, as it can lead to aggression.
• Temperament: Generally peaceful but may be shy, especially when first introduced. They should not be housed with overly aggressive species.
• Compatible Tank Mates: Suitable companions include other peaceful reef fish, such as gobies, blennies, and small wrasses. Avoid housing with aggressive or overly competitive feeders.
Providing a peaceful environment with compatible tank mates will help reduce stress and encourage natural behaviors.
Important Considerations
• Acclimation: Ventralis Anthias can be sensitive to changes in water parameters. Use a slow drip acclimation process to