Marbled Bichir Care Guide - Tank Setup, Diet & Breeding

The Marbled Bichir is a distinctive bottom-dwelling predator with an elongated, snake-like body, a broad flattened head and a series of small, separate dorsal finlets. Its body is usually brownish or olive-grey, marked with irregular darker marbling that helps it blend into shaded river environments. The pectoral fins give it a surprisingly purposeful, almost limb-like movement across the bottom.

The Marbled Bichir is native to Central Africa, particularly the lower and middle Congo River Basin in the Democratic Republic of the Congo. It inhabits slow-moving freshwater environments, including quiet channels, flooded areas and swampy habitats.

A single Marbled Bichir should have at least 400 litres, with a footprint of roughly 150 x 60 cm or larger; floor space is more important than height. Use a secure, tightly fitted lid because bichirs are powerful escape artists and regularly surface to breathe atmospheric air. Provide broad open areas, caves, driftwood and smooth rocks for shelter, with a soft sand substrate that will not damage the fish's underside. Leave some clear surface access and avoid sharp decorations or gaps behind equipment.

Marbled Bichirs can reach about 35 cm (13.8 in) in total length. Females are often slightly larger and heavier-bodied than males, although individual size varies.

Marbled Bichirs are carnivores and do best on a varied diet of meaty foods. Offer sinking carnivore pellets alongside earthworms, prawns, mussel, strips of fish and other appropriately sized frozen or prepared foods. They often feed most actively after dark, and uneaten food should be removed promptly to protect water quality.

Suitable tankmates include robust, peaceful fish too large to swallow, such as large Congo tetras, silver dollars, severums, peaceful larger cichlids and other similarly sized bichirs. Avoid small tetras, livebearers, dwarf cichlids, shrimp and other bite-sized tankmates, as they may be treated as prey. Highly aggressive fish and fin-nipping species are also poor companions, while multiple bichirs can generally be kept together in a sufficiently spacious aquarium.

Breeding Marbled Bichirs is uncommon in home aquaria and usually requires a large, mature breeding setup. A seasonal change with slightly cooler, softer water followed by warmer, well-conditioned water can encourage spawning. The pair scatter adhesive eggs among fine-leaved plants or a spawning mop, after which the eggs should be removed because the adults may eat them. The tiny larvae hatch after several days and need small meaty foods, excellent water quality and careful separation as they grow.

Males generally have a noticeably broader, thicker anal fin, which is used during spawning, while females tend to be larger and more robust. These differences are most reliable in mature fish.