Common name: Anna's Chromodoris

Scientific name: Chromodoris annae Bergh, 1877

General Information

The Chromodoris annae, commonly known as Anna's Chromodoris, is a stunning species of nudibranch that captures the attention of marine enthusiasts with its vibrant color pattern. This sea slug is celebrated for its striking blue body with black lines, yellow to orange margins, bright orange rhinophores, and vivid orange gills, making it a living jewel of the sea. While not as commonly kept in home aquariums due to its specialized care requirements, it is a favorite subject for underwater photographers and divers.

In the wild, Chromodoris annae plays a role in the marine ecosystem as a grazer of sponges and other sessile invertebrates. Its vivid coloration is not just for show; it serves as a warning to potential predators about its toxic nature, which is derived from the sponges it consumes. These toxins make it unpalatable to potential predators, serving as an effective defense mechanism that is common among nudibranchs.

Details

Recommended minimum tank volume
100 liter (26 gallons)
Salinity
S.G. 1.023 to 1.026
Temperature
24 to 28 °C (75 to 82 °F)
Acidity
pH 8.1 to 8.4
Average size
5 cm (2″)
Care level
Very difficult
Diet
Spongivore Feeds primarily on specific sponges in the wild
Reefsafe
Yes
Aggression
Peaceful
Captive bred
No

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Mollusks
    Mollusca
  3. Class
    Gastropods
    Gastropoda
  4. Order
    Nudibranchs
    Nudibranchia
  5. Family
    Chromodorid Nudibranchs
    Chromodorididae
  6. Genus
    Chromodoris Nudibranchs
    Chromodoris
  7. Species
    Anna's Chromodoris
    Chromodoris annae Bergh, 1877
  8. Source: GBIF | Global Biodiversity Information Facility

Care

Keeping Chromodoris annae in captivity is challenging and typically not recommended for novice aquarists. This species requires a mature reef tank with stable water parameters and a well-established population of specific sponges, such as those from the genus Dysidea and Aplysina, which constitute its primary diet. Due to its dietary specialization, it often struggles to thrive in home aquariums.

Diet and Feeding

Chromodoris annae is a specialized feeder, primarily consuming sponges. In captivity, replicating its natural diet is difficult, as it may not accept substitute foods. This dietary specificity is a major challenge for aquarists attempting to maintain this species in a home aquarium.

Behavior and Compatibility

Chromodoris annae is a peaceful species that poses no threat to other tank inhabitants. However, its care requirements and dietary needs make it unsuitable for most community tanks. It is best appreciated in a display dedicated to nudibranchs or in public aquariums where its needs can be met.

Health and Common Issues

The primary challenge in keeping Chromodoris annae is ensuring it has access to its natural diet of sponges. Without this, it is unlikely to survive long-term in captivity. Additionally, maintaining pristine water quality is crucial to prevent stress and disease.

Habitat

Chromodoris annae is found in the Indo-Pacific region, particularly around coral reefs where sponges are abundant. It prefers warm, tropical waters and is often observed at depths ranging from shallow reefs to about 30 meters.