Tiger Moray Eel (Gymnothorax Polyuranodon)

Tiger Moray Eel (Gymnothorax polyuranodon)

The Tiger Moray Eel is a fascinating specialist moray admired for its eel-like body, bold spotted patterning and unusual ability to live in freshwater and brackish-influenced environments. Also known as the Freshwater Moray, Freshwater Tiger Moray, Spotted Freshwater Moray or Leopard Moray, this species is best suited to mature specialist aquariums with excellent filtration, secure covers, smooth décor and carefully chosen tankmates. It is a predatory escape artist and should only be kept by experienced aquarists with a long-term plan.

Common Name:
Tiger Moray Eel, Freshwater Moray, Freshwater Tiger Moray, Spotted Freshwater Moray, Leopard Moray

Scientific Name (Latin):
Gymnothorax polyuranodon

Maximum Size:
Approximately 60–90 cm

Water Type:
Freshwater / Brackish-capable

Origin / Natural Habitat:
The Tiger Moray Eel is found across parts of the Indo-Pacific region, where it may occur in freshwater rivers, estuarine areas, coastal-influenced waters and connected habitats.

Although it is often sold as a freshwater moray, this species may experience varying mineral and salinity conditions depending on locality and life stage.

In the aquarium, supplier water conditions should be checked and matched carefully, especially if the eel has been kept in brackish water.

Water Parameters:
Temperature: 24–28°C
pH Range: 7.0–8.2
Hardness: Moderate to hard preferred
Salinity: Freshwater to brackish, depending on supplier conditions
Ammonia/Nitrite: 0 ppm
Nitrate: Kept low and stable
Oxygenation: Strong filtration and good oxygenation required

Temperament:
Predatory / Specialist

Tiger Moray Eels are not community fish. They are predatory and may eat fish, shrimp or other animals small enough to be swallowed.

They are generally secretive rather than openly aggressive, but they have a strong feeding response and should be housed only with suitable robust tankmates that cannot fit in the mouth.

Diet:
Carnivore / Predator

The Tiger Moray Eel should be fed a varied meaty diet.

Suitable foods include prawns, mussel, cockle, squid, white fish pieces, lancefish, krill, earthworms and other suitable frozen or fresh meaty foods.

Some individuals may learn to take prepared predator foods, but many need patience when settling.

Avoid feeder fish, as they can introduce disease, encourage poor feeding habits and are not a balanced long-term diet.

Use feeding tongs with care and never hand-feed, as morays have a strong bite.

Minimum Tank Size:
Approximately 450–600 litres for long-term care

A larger aquarium is strongly preferred for adult specimens.

The aquarium should provide secure caves, smooth rockwork, shaded retreats and enough floor space for the eel to move without damaging its skin.

Behaviour & Activity:
The Tiger Moray Eel is mostly nocturnal or crepuscular, often spending the day resting in caves, pipes, rockwork or shaded areas.

It may become more active at feeding time or after lights dim.

Morays are excellent escape artists and can push through small gaps, so every opening around lids, filters, pipes and cables must be secured.

Community Suitability:
Specialist Predator Aquarium

The Tiger Moray Eel is best kept in a species-focused aquarium or carefully planned large predator setup.

Potential tankmates must be large, robust and peaceful enough not to harass the eel, while also being too large to swallow.

Avoid small fish, shrimp, crabs, snails that may be eaten, delicate species, fin-nippers, aggressive cichlids likely to bite the eel, and any tankmate that may compete dangerously at feeding time.

Special Requirements or Care Notes:
This is a specialist moray and should not be bought for a standard freshwater community aquarium.

Check whether the supplier has kept the eel in freshwater or brackish water and acclimate slowly.

Provide smooth caves, PVC pipes or stable rockwork so the eel can hide securely.

Avoid sharp décor, rough rocks or abrasive substrate that could damage the skin.

Excellent filtration is essential, as morays produce heavy waste from meaty foods.

Keep the aquarium tightly covered with no escape gaps.

Use caution during maintenance and feeding, as morays can bite.

This species is best suited to experienced aquarists familiar with large predatory fish, brackish-capable species or specialist oddball aquariums.

Suitable for:
Experienced

Availability:
Availability can vary depending on season, supplier and size. This species is usually an occasional specialist import.

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.