Zebra blenny - Omobranchus zebra

Scientific name: Omobranchus zebra

Common name: Zebra blenny

Family: Blenniidae

Usual size in fish tanks: 5 - 6 cm (1.97 - 2.36 inch)

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Recommended pH range for the species: 7.5 - 8.7

Recommended water hardness (dGH): 17 - 30°N (303.57 - 535.71ppm)

0°C 32°F30°C 86°F

Recommended temperature: 20 - 28 °C (68 - 82.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: South Asia

Temperament to its own species: aggressive/territorial

Temperament toward other fish species: aggressive/territorial

Usual place in the tank: Bottom levels

Food and Feeding

The Zebra Blenny (Omobranchus zebra) is an opportunistic feeder that thrives on a varied diet of live or frozen foods. They readily accept bloodworms, microworms, and brine shrimp. These fish are natural substrate sifters, searching for small organisms, so adding copepods and rotifers to the tank benefits their diet. High-quality sinking pellets or algae wafers can also be offered to supplement their nutrition. Feed them small portions 2-3 times daily to mimic their natural foraging behavior and prevent waste buildup.

Origin

The Zebra Blenny is native to the Indo-Pacific region, with populations found in India, Malaysia, Indonesia, Singapore, and the Philippines. They inhabit coastal waters, estuaries, and mangrove areas, where they adapt to fluctuating salinity levels. These environments are characterized by rocky or sandy substrates, brackish water, and dense vegetation, offering plenty of shelter and feeding opportunities.

Sexing

Sexing Zebra Blennies is challenging, as there are no easily visible differences between males and females. Behavioral observation during the breeding season may help identify males, as they tend to become more territorial and protective of spawning sites.

Breeding

Breeding Omobranchus zebra in captivity is rare but possible under the right conditions. Set up a dedicated breeding tank with brackish water (specific gravity of 1.005-1.015) and provide plenty of hiding spots such as caves, PVC pipes, or rock formations for spawning sites. The male guards the eggs, fanning them to ensure oxygenation and protecting them from predators. The eggs typically hatch within 5-7 days, depending on water temperature. Once hatched, the fry are planktonic and require fine live foods like rotifers or infusoria for initial growth. Maintaining stable water parameters and reducing stress are essential for successful breeding.

Lifespan

With proper care, Zebra Blennies can live 3-5 years in captivity. Stable water conditions, a nutritious diet, and a stress-free environment are crucial for maximizing their lifespan.

Tank Setup

The Zebra Blenny thrives in a brackish tank environment. Use a sandy substrate to accommodate their substrate-sifting behavior, and include rock formations, bogwood, and other decorations to create caves and hiding spots. Floating plants or mangrove roots can help mimic their natural habitat while providing shaded areas. Maintain water salinity at a specific gravity of 1.005-1.015, with ideal water parameters: pH 7.5-8.7, hardness 17-30°N (303.57-535.71 ppm), and temperature 20-28°C (68-82.4°F). Gentle filtration is recommended to ensure clean water without creating strong currents. Regular water changes are essential to maintain optimal water quality.

Compatible Tankmates

Zebra Blennies are territorial and aggressive toward smaller or similarly sized fish, making careful selection of tankmates essential. Ideal companions include larger, peaceful brackish species such as Mono Sebae, or Figure-Eight Puffers. Avoid keeping them with small or slow-moving species that may become targets of aggression. Providing ample hiding spots and visual barriers can help reduce territorial disputes.

Short Description

The Zebra Blenny (Omobranchus zebra) is a unique and active addition to brackish aquariums. This Indo-Pacific species is known for its substrate-sifting behavior and territorial nature. They thrive in tanks with sandy substrates, rock formations, and plenty of hiding spots. While their care requires attention to salinity and water quality, their fascinating behavior and adaptability make them a rewarding choice for experienced aquarists.