Cherax nigli

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Cherax nigli, also known as Peacock Cherax, is a freshwater crayfish highly valued in the aquarium trade for its coloration and rarity. Native to Indonesian New Guinea, this species is recognized by its sturdy carapace, well-developed claws, and bluish contrasts. It requires a spacious, carefully structured aquarium with plenty of hiding places, as it is territorial and mainly active around dusk and during the night. This wild-collected species is offered exclusively by Ton.Fish in Canada; its availability remains very limited for Canadian aquarists.

General species description

Cherax nigli is a crayfish of the genus Cherax, adapted to life on the bottom of freshwater streams. Like several crayfish from New Guinea, it alternates between resting in shelters and exploring its surroundings, especially at night. It is best kept in a species aquarium or in a very generously decorated setup rather than in a standard community tank. Each specimen needs enough territory to reduce confrontations, particularly during moulting, when its shell is temporarily soft and vulnerable. Territorial behavior and the need for secure shelters are therefore central husbandry considerations. Very rare in the trade, this wild species should be acclimated gradually, with close attention paid to water quality.

Geographical origin and biotope

Country of reference: Indonesia. Cherax nigli comes from the Indonesian part of New Guinea, commonly called West Papua. It inhabits freshwater environments where the bottom provides stones, submerged wood, leaf litter, and crevices used as shelter. In the aquarium, this structure can be recreated with non-sharp substrate, tubes, stable rocks, and roots. Efficient filtration, good oxygenation, and copper-free water are essential for crayfish. Captive care should focus on stable conditions rather than rapid parameter changes, especially after transporting a wild-collected animal. A calm, well-structured aquarium helps reduce stress and gives the crayfish opportunities to establish a secure retreat.

Precise location and local name

The known range of Cherax nigli is in West Papua, Indonesia, on the island of New Guinea. The aquarium trade mainly uses the English name Peacock Cherax, referring to its colourful appearance. This name is useful commercially, but it does not replace scientific identification, which is important to avoid confusion with other blue or multicoloured Cherax. Because the species is very rare, any available origin and traceability information should be kept with the animal after purchase. For a wild specimen, slow acclimation, careful observation during moulting, and stress reduction are particularly important.

Appearance and physical characteristics

Cherax nigli has the typical form of a large crayfish: a segmented body, hard carapace, articulated abdomen, long antennae, and claws used for defence and food handling. Its coloration is dominated by dark bluish tones and contrasting areas, which explains the common name Peacock Cherax. Colour intensity may vary with age, stress, water quality, and lighting. The claws and walking legs may show lighter or stronger shades. As with all crustaceans, growth occurs through moulting; a shelter inaccessible to other inhabitants is essential at this time. Stable water chemistry and a low-stress environment help support a successful moult.

General diet

Cherax nigli is an omnivorous and opportunistic crayfish. Its diet may include quality sinking pellets, plant foods such as blanched zucchini or spinach, and small portions of protein-rich foods. Dried catappa or oak leaves that have not been treated with chemicals can provide plant matter and enrich the habitat. Uneaten food should be removed to protect water quality. Moderate portions offered mainly in the evening suit its crepuscular and nocturnal activity pattern. Dietary variety and an adequate mineral supply support a successful moult and the development of a strong carapace. Copper-containing medications and unnecessary overfeeding should be avoided.

Essential data

• Local name used: Peacock Cherax
• Origin of the scientific name: Cherax is the genus name; nigli is the specific epithet.
• Common/vernacular names: Peacock Cherax
• Family: Parastacidae
• Subfamily: Parastacinae
• Name pronunciation: KERR-ax NIG-lee
• Geographical origin: West Papua, Indonesia
• Maximum adult size: approximately 15 cm
• Water temperature and pH: 22 to 26 °C; pH around 6.5 to 7.5
• Stream appearance and surrounding vegetation: freshwater habitats structured by stones, wood, leaf litter, and riparian vegetation
• Typical tankmates: no fish recommended; best kept in a species aquarium
• Temperament and behaviour: territorial, opportunistic, mainly active in the evening and at night
• Sexual dimorphism: adult males generally develop larger claws; examination of the underside of the abdomen helps confirm the sex
• Bottom configuration and flow: substrate, stones, and wood, with regular water movement and good oxygenation
• Availability: very rare, wild-collected, and exclusive to Ton.Fish in Canada

In your aquarium

To succeed with Cherax nigli, provide a spacious, well-filtered aquarium with many stable hiding places. Clean water, moderate temperature, no copper, and a varied diet are the foundations of good long-term care. Separate shelters should also be provided to reduce injuries during moulting. Since this is a very rare wild-collected species, each specimen deserves gentle acclimation and attentive maintenance, ideally in a dedicated species aquarium. Stable conditions and careful feeding are more important than intense lighting or a heavily stocked setup.