Barred-fin moray

Gymnothorax zonipectis, commonly known as the barred-fin moray or bar-tail moray eel, is native to the warm tropical waters of the Indo-Pacific. Its distribution ranges from East Africa and the Red Sea to the Samoa and Marquesas Islands, extending north to the Ryukyu Islands in Japan and south to the Great Barrier Reef. It inhabits outer reef slopes and steep drop-offs at depths of 8 to 40 meters.

This moray eel belongs to the family Muraenidae and the genus Gymnothorax. It features a muscular, elongated serpentine body lacking pectoral and pelvic fins, with the dorsal fin beginning near the head and merging with the caudal and anal fins. It possesses powerful jaws lined with sharp, backward-pointing teeth designed to grip prey. It reaches a maximum length of 45 to 50 centimeters.

It is a nocturnal and solitary predator. During daylight, it remains hidden within deep rocky crevices, typically exposing only its head to breathe (characterized by rhythmic opening and closing of the mouth). While not inherently aggressive toward large tankmates, it is an opportunistic carnivore that will hunt small fish and crustaceans under the cover of darkness.

The base body coloration is light brown or tan, covered by a complex pattern of dark spots and irregular lines. Its defining feature is the zebra-like pattern of alternating dark and light vertical bars on the dorsal and anal fins, especially toward the tail. Distinct dark oblique stripes run behind the eyes. Sexual dimorphism is not visibly distinct.

Requires a specific marine aquarium of at least 300 to 400 liters (approx. 80-105 gallons) with an exceptionally secure rock aquascape. Live rocks must be epoxied or placed directly on the bottom glass to prevent collapses from burrowing. Large, dark caves are mandatory for shelter. The aquarium must be sealed with a heavy, tight-fitting lid, as they are escape artists.

It is a strict carnivore. In captivity, feed a diet of fresh or frozen meaty foods such as shrimp, squid, fish fillets, clams, and small whole baitfish (like silversides). Always feed using long plastic or wooden tongs to avoid accidental bites, as they have poor eyesight but an excellent sense of smell. Feed 2 to 3 times per week.

Produce a significant amount of organic waste, requiring efficient mechanical filtration, regular 15-20% water changes, and an oversized protein skimmer. Maintain water temperatures between 24°C and 28°C (75°F to 82°F), with pH between 8.1 and 8.4 and stable specific gravity between 1.021 and 1.025. Nitrates must be monitored and controlled.

Can only be housed with large, robust fish that cannot fit into their mouth, such as large surgeonfish, large angelfish, triggerfish, and lionfish. Any small fish or ornamental invertebrates (shrimp, crabs) will be hunted and consumed at night. Avoid housing with other moray eels unless the aquarium is exceptionally large.

Captive breeding is not reported for this species in home aquariums. In nature, morays release pelagic eggs that float in open waters. The larvae, known as leptocephali, are transparent and leaf-shaped, drifting in the plankton for several months before undergoing metamorphosis and settling onto rocky reef structures.

This species is hardy, featuring a scale-less skin protected by a thick mucus layer, making it resistant to typical external parasites. The primary health risk is physical trauma from escape attempts or rock collapses. In case of accidental bites, wounds can easily become infected due to bacteria present in the moray's mouth.