Melanotaenia Fluviatilis

Datasheet

General Description

The Australian Rainbowfish, also known as the Murray River or crimson-spotted rainbowfish, is a species that stands out due to its unique patterning and coloring. Often confused with the M. duboulayi, the M. fluviatilis boasts distinctive characteristics, including fin ray counts and reproductive traits. This species thrives in slightly hard, alkaline water conditions, reflective of its native Australian habitats.

Aquarium Setup

To provide a suitable environment for the Australian Rainbowfish, a planted aquarium with dense vegetation and open swimming areas is ideal (see table). Efficient filtration is essential to maintain water quality and encourage vibrant coloration in male fish. The tank should reflect the fish's preference for slightly hard, alkaline water conditions, with a pH range of 6.5-8.0 and a temperature between 20-25°C.

Behaviour

Known for its peaceful nature, the Australian Rainbowfish can sometimes agitate smaller or slower fish with its rapid movements and relatively large size. This species thrives when kept in a school of at least 6-8 individuals or more. When housed with conspecifics, males are encouraged to display their best colors. Suitable tankmates include similarly-sized rainbowfish, characins, danios, barbs, and catfish like Corydoras.

Feeding and Diet

The Australian Rainbowfish is an unfussy eater and readily accepts a variety of dried, frozen, and live foods. Regular feedings of live foods enhance coloration in these fish. A diet rich in live foods will bring out the best colors in this species.

Reproduction & Dimorphism

Breeding the Australian Rainbowfish is relatively uncomplicated, as it is an egg-scattering species. Males, which are larger and more colorful than females, display vibrant hues during breeding. Females become plumper when ready to spawn, and the pair can be introduced to a separate breeding tank. Eggs are laid daily and require close monitoring for successful fry rearing.

Habitat and Distribution

In the wild, the Australian Rainbowfish inhabits slow-moving river sections, ponds, ditches, and lakes in Queensland and New South Wales, Australia. These habitats feature clear water with abundant aquatic vegetation. The adaptive nature of this species allows it to thrive in environments with varying water temperatures and chemistry.