Emperor snakehead

Channa marulioides

A tail-base ocellus and irregular flank patches on a large predator

A robust elongated body often carries an orange-rimmed dark ocellus on the upper tail base. Golden-brown or darker flanks may show irregular patches with pale edges on some scales.

Adult length: Up to 27 cm
Water temperature: 22–30 °C

Natural habitat: Inhabits swamp-forest waters.

Reaches 65 cm. A 12–15 cm fish on sale needs a permanent plan for a large adult before purchase.

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Appearance and identification

A river-and-lake fish of Southeast Asia that varies with origin and growth. Compare the ocellus and pale-edged flank patches with C. melanoptera; markings may weaken with age. Highly saturated red trade photographs are not typical colour.

Adult space

Allow generous turning, swimming and maintenance space, substantial cover, a secure lid and surface access. The size on sale does not show permanent needs.

Diet and feeding

A fish-eating predator. Offer suitable animal foods and check that they are taken. Tameness toward the keeper does not make it an omnivore.

Same-species behaviour

Relatively peaceful with some fish too large to swallow, but pairing or grouping is not assured; watch for chasing and food access and be ready to separate fish.

Compatibility limits

Being too large to swallow is only one factor. Injury, competition and adult space matter; small fish and shrimp are at risk.

Aquarium environment

Plants can provide cover if they do not block turning or access to the surface.

Sources

www.aquariumglaser.de ↗ 2026-10-22

www.fishbase.se ↗ 2026-10-25

researcharchive.calacademy.org ↗ 2026-10-22

pubs.usgs.gov ↗ 2026-10-22