Common name: Cloudy Moray

Scientific name: Gymnothorax nubilus (Richardson, 1848)
A close up of a Grey Moray (Gymnothorax nubilus) in the Poor Knights marine preserve of New ZealandA close up of a Grey Moray (Gymnothorax nubilus) in the Poor Knights marine preserve of New Zealand

General Information

The Cloudy Moray, scientifically known as Gymnothorax nubilus, is a fascinating species of moray eel found in the Indo-Pacific region. With its distinctive mottled pattern, this eel is a striking addition to any marine aquarium, though it is not as commonly kept as some of its more famous relatives. Its unique coloration and elongated body make it an attractive choice for those looking to add a bit of the wild ocean to their home.

In the aquarium trade, the Cloudy Moray is appreciated for its intriguing appearance and relatively hardy nature. While not as widely recognized as the Ocellaris Clownfish, it holds its own appeal for dedicated aquarists interested in more unusual species. This species is not commonly found in the average home aquarium, making it a unique talking point for those who do keep it.

Details

Estimated price
Expensive
Recommended minimum tank volume
400 liter (110 gallons)
Salinity
S.G. 1.023 to 1.026
Temperature
24 to 28 °C (75 to 82 °F)
Acidity
pH 8 to 8.4
Average size
1 m (3′3″)
Care level
Moderate to difficult Requires a secure lid and stable water conditions
Diet
Carnivore Feeds on shrimp, squid, and fish fillets in captivity
Social
Solo Solitary by nature; best as the primary focus in a tank
Reefsafe
No
Aggression
Semi aggresive May prey on smaller tank mates; best with robust species
Captive bred
No
IUCN Red List
EX
EW
CR
EN
VU
NT
LC

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Chordates
    Chordata
  3. Class
    Ray-finned Fishes
    Actinopterygii
  4. Order
    Eels
    Anguilliformes
  5. Family
    Moray Eels
    Muraenidae
  6. Genus
    Moray Eels
    Gymnothorax
  7. Species
    Cloudy Moray
    Gymnothorax nubilus (Richardson, 1848)
  8. Synonyms
    Gymnothorax eupterus (Günther, 1870)
    Muraena euptera Günther, 1870
    Muraena nubila Richardson, 1848
  9. Source: GBIF | Global Biodiversity Information Facility

Care

Caring for a Cloudy Moray requires a commitment to providing a suitable environment that mimics its natural habitat. These eels thrive in well-established marine aquariums with plenty of hiding spots created by live rock structures. While they are hardy, maintaining stable water conditions is crucial to their health.

A large tank is necessary to accommodate their potential size and active nature. They require a secure lid as they are known to explore and can escape from open tanks. The tank should have adequate filtration and water flow to simulate their natural environment.

Diet and Feeding

Cloudy Morays are carnivorous, feeding primarily on fish and crustaceans in the wild. In captivity, they should be offered a diet rich in meaty foods such as shrimp, squid, and fish fillets. Feeding should occur two to three times a week, with portions adjusted based on the eel's size and activity level.

Providing a varied diet helps ensure they receive all necessary nutrients and keeps them engaged during feeding times. It's important to monitor their intake to prevent overfeeding and maintain water quality.

Behavior and Compatibility

The Cloudy Moray is known for its semi-aggressive temperament. While they can coexist with other species, caution is advised as they may prey on smaller fish or invertebrates. They are best housed with larger, robust tank mates that can hold their own.

These eels are solitary by nature and do not require companionship, making them suitable for tanks where they are the primary focus. Their behavior is fascinating to observe, particularly their hunting and feeding habits.

Health and Common Issues

Cloudy Morays are generally hardy but can be susceptible to common marine health issues if water quality is not maintained. Regular monitoring and maintenance of tank conditions are essential to prevent ailments such as skin infections or parasitic infestations.

When selecting a Cloudy Moray, look for individuals that are active and have clear eyes and smooth skin. Avoid eels that appear lethargic or have visible signs of distress.

Habitat

Native to the Indo-Pacific, the Cloudy Moray inhabits coral reefs and rocky crevices where it can hide and hunt. They are typically found at depths ranging from shallow waters to several meters deep, preferring areas with plenty of cover and moderate water flow.