Ctenops Nobilis

Datasheet

General Description

The Frail Gourami, scientifically known as Ctenops Nobilis, is the sole recognized species within the genus Ctenops. This freshwater fish possesses an accessory breathing organ called the labyrinth organ, allowing it to breathe atmospheric air to some extent, with its structure becoming more complex in oxygen-deprived environments. Belonging to the Osphronemidae family, this species is described as difficult to acclimate due to sensitivity during the export and shipping process, often leading to health issues upon arrival.

Aquarium Setup

When setting up an aquarium for the Frail Gourami, which requires a minimum tank size of 120 liters, it is essential to provide ample coverage and structure. This species does well with various decor elements like ceramic flowerpots, plastic piping, and natural materials such as wood roots, branches, and dried leaf litter. Dim lighting and dense planting with species like Microsorum and Anubias are recommended, along with a layer of floating vegetation to diffuse light and offer cover. Maintaining excellent water quality is crucial, with moderate filtration and weak water flow preferred in slower or still water conditions.

Behaviour

The Frail Gourami is not typically suited for the average community aquarium due to its territorial behavior, especially towards conspecifics. While juvenile individuals may display more social tendencies, adults are known to be openly hostile and even aggressive, particularly during breeding or in warmer temperatures. Maintaining a group of these fish requires a large tank with ample hiding spots and visual barriers to minimize aggression.

Feeding and Diet

As micropredators, Frail Gouramis feed on small aquatic crustaceans, worms, insect larvae, and zooplankton. Initially, they may not accept prepared foods, but over time, they can be trained to eat granular foods. Offering a variety of live or frozen foods like Artemia nauplii and Daphnia is recommended to enhance coloration and overall conditioning.

Reproduction & Dimorphism

Frail Gouramis are paternal mouthbrooders, with males carrying the eggs in their anal fin. Breeding can be successful in group or pair settings with proper water quality and diet maintenance. Sexual dimorphism is subtle, with females exhibiting a straight lower jaw profile and sleeker head shape compared to males, who have a slightly rounded lower jaw due to mouthbrooding adaptations.

Habitat and Distribution

Originally described from Sikkim state in northeastern India, the Frail Gourami is also found in West Bengal, Bihar, Assam, northern Bangladesh, and more recently in Nepal. Inhabiting regions with temperate climates and heavy rainfall, this species is part of the Ganges and Brahmaputra river systems in areas experiencing seasonal variations in water depth, volume, and flow.