Melanotaenia Lacustris

Datasheet

General Description

The Lake Kutubu Rainbowfish, scientifically known as Melanotaenia Lacustris, is a striking species native to Papua New Guinea, specifically the Southern Highlands Province. Endemic to Lake Kutubu and the River Soro, this fish is unfortunately under the threat of overfishing and industrial activities that endanger its natural habitat.

Aquarium Setup

To provide an ideal environment for the Lake Kutubu Rainbowfish, a tank of at least 110 liters in capacity is recommended. The setup should include dense vegetation for cover and open spaces for swimming. Water conditions should be kept slightly hard and alkaline, with a pH range of 7.0-9.0 and a temperature between 20-25°C. Efficient filtration is crucial to support the development of the male fish's vibrant colors, while minimal water movement is preferred.

Behaviour

Known for its peaceful nature, the Lake Kutubu Rainbowfish can become problematic for smaller or slower fish due to its rapid movements and relatively large size. This species thrives when kept in groups of 6-8 or more, as they tend to be more comfortable and display their best colors in the company of conspecifics. Suitable tankmates include similarly-sized rainbowfish, characins, danios, barbs, freshwater gobies, catfish like Corydoras, and some species of Rift Lake cichlids.

Feeding and Diet

The Lake Kutubu Rainbowfish is an omnivorous species that readily accepts a variety of dried, frozen, and live foods. Regular feedings of live foods help enhance the fish's coloration, allowing them to exhibit their full vibrancy.

Reproduction & Dimorphism

Breeding the Lake Kutubu Rainbowfish is relatively straightforward, as they are egg scatterers. The adults should be conditioned in a separate aquarium with live and frozen foods before selecting the best-colored pair for breeding. Females will appear plumper when ready to spawn, and males will display intensively to each other. Mature males exhibit brighter colors and grow larger than females, developing a deeper body as they reach maturity.

Habitat and Distribution

Endemic to Lake Kutubu and the River Soro in Papua New Guinea, the Lake Kutubu Rainbowfish thrives in the clear, still waters of the lake, where they congregate around aquatic vegetation, submerged roots, and logs. The lake, initially formed by volcanic debris blockage, is a vital habitat for numerous endemic species, showcasing significant biodiversity.