马达加斯皮杜银汉鱼 · Madagascan Rainbow Fish

Overview

A peaceful schooling fish from eastern Madagascar, Bedotia madagascariensis is often traded under the name of a related species. Adult male tail pattern is useful for identification. A richly furnished aquarium helps bring out coloration that may remain subdued in sparse surroundings.

Distribution & habitat

Known range lies along the eastern Atsinanana coast in small streams and lower river sections draining into coastal lakes and lagoons. Shaded, clear water without excessive current is favored, with acidic black-water swamps also used. Juveniles gather along shallow margins while adults use deeper water, sometimes in groups of several dozen.

Aquarium setup

Use at least a 120 by 30 cm footprint for regular housing. Dense planting, wood, some floating cover, and modest leaf litter provide a sheltered setting that encourages confidence and color.

Maintain high oxygen and consistently clean water, with weekly changes of 30–50%. Wild fish may require more acidic conditions than farmed stock, so provenance can affect acclimation needs.

Diet & feeding

Terrestrial insects and other invertebrates are the main natural foods. Quality flakes or granules can be paired with regular small live or frozen bloodworms, daphnia, and Artemia. More plentiful live food is useful when conditioning breeders.

Behaviour & compatibility

Peaceful companions of similar size include rainbowfishes, barbs, characins, cichlids, and catfish. Keep at least eight to ten to reduce nervousness and encourage male displays. Avoid mixing with other members of the genus because hybridization is possible.

Sexual dimorphism

Adult males show brighter overall color and more elaborate pigmentation in the unpaired fins. Females are fuller-bodied, especially when carrying eggs.

Breeding

Eggs are placed in fine vegetation, moss, or floating synthetic mops. Use a pair or one male with two or three females. A female can lay several robust eggs daily; remove them individually or leave breeders briefly, removing adults when the first fry appear. Provide solid cover because males may pursue females intensely.

Incubation lasts about 7–10 days. Begin with infusoria-sized live food or suitably fine prepared powder, introducing Artemia nauplii after roughly a week. Early fry are very sensitive to environmental changes, so water management must avoid abrupt fluctuations and later changes should be small and careful.

Notes

In males, the lateral dark band continues into the central tail rays, surrounded by pale and darker borders. Red, yellow, and white proportions vary among individuals. Similar relatives with different tail patterns have caused persistent trade misidentification.