Gymnothorax melatremus
Source: Oceanreef.dk - Kasper Hareskov Tygesen

Facts

Latin name Gymnothorax melatremus - Schultz, 1953
Common name Dwarf moray
Family Muraenidae - Gymnothorax
Origin East Indian Ocean, West Indian Ocean, Australia, Japan, Indonesia, East Pacific, Central/West Pacific
Max length 30.0 cm (11.8")

As aquarium fish

Minimum volume 300 l (79 gal)
Hardiness Hardy
Suitable for aquarium Suitable with care
Reef safe Reef safe with caution
Aggressiveness Might be aggressive towards similar species

Food

Recommended
  • Larger crustaceans (Shrimp, crabs...)
  • Fish

Threat towards crustaceans

This species poses a threat towards shrimps and crabs etc., which are relatively small.

Can be a threat to small fish

This spicies might be a threat to smaller fishes.

Feeding of Moray eels

Morays should be fed a large meal every 3-4 days, as they otherwise can harm themselves by over eating.
If one has problems with getting the Morays to eat frozen fish or crustaceans, try moving the food in front of the fish with a tweezer. 

Do note, that the food must be varied and raw/fresh, whole shrimps or smelt (small fish) for example.

It can take a week before they start feeding in the aquarium, but this is not a problem.
Try feeding them live fish or shrimp if the Morays iare not eating frozen foods after a week. 

Escape specialist

Morays can easily escape from aquaria, they can even move loose lids and glass covers without problems.

Rearranges rocks and sand

This species has a habit of rearranging rocks and sand.

Make sure rocks are placed securely on the substrate, so they cannot toppled over.

Hermaphroditic

This species can change gender from female to male.

When a male is needed, a female changes sex and takes on the role.

Hiding places

This species needs good hiding places, for example, between live rocks.

Family description (Muraenidae)

Moray eels (Muraenidae) are predatory fish that will most commonly live off fish or crustaceans. 

To avoid overfeeding, the Moray must only be fed every 3-4 days, but may then also have a large meal.

They may dig up the substrate or move loose objects in the aquarium, so fastening the rocks and corals to the tank is a good idea.
Moray eels can easily escape from the tank if not tightly closed. They can lift lids and glass covers, do not underestimate their escape ability.

It is important that the Moray can, with its full length, hide between the rocks.

There are a few Moray eels which are suitable for reef aquaria, but the bigger species can only live in large tanks with other big fish.

Many Morays have a slightly poisonous bite, although it is not normally dangerous for people. One must not underestimate the strength of their bite however.  

FishBase

Aquarium trade Rarely
Distribution Indo-Pacific: East Africa to the Marquesas and Mangaréva, north to the Hawaiian Islands, south to the Australs.
English common names Dirty yellow moray, Dwarf moray, Blackspot moray
Danish common names Gul dværgmuræne
French common names Murène jaunâtre

References and further reading

About references

Scott W. Michael. 2001. Reef Fishes volume 1 - TFH Publications / Microcosm Ltd. - (English)
Frank Marini. 2002. A Serpent For Your Reef Tank: A Look at Fish-Safe Eels - Reefkeeping Magazine - (English)
Mike Maddox. 2009. Morays! - Tropical Fish Hobbyist Magazine - (English)
Kirby Adams. Five Favorite Eels - Wet Web Media - (English)
Bob Fenner. The Moray Eels, Family Muraenidae, pt. 1 - Wet Web Media - (English)
Bob Fenner. The Moray Eels, Family Muraenidae, pt. 2, Less Aquarium Suitable Species - Wet Web Media - (English)
Marco Lichtenberger. 2007. Moray Eels Bite—But Are They Poisonous? - Tropical Fish Hobbyist - (English)

Froese, R. and D. Pauly. Editors. 2014. FishBase. World Wide Web electronic publication. www.fishbase.org, version (08/2014).

Tags

hermaphroditic, destructive, eats shrimp, eats crab, eats fish, predatory, eel
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