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Cherax peknyi, also known as Zebra Lobster, is a freshwater crayfish from New Guinea. Its sturdy body, well-developed claws and striped pattern give it a very distinctive appearance in the aquarium. This species remains **relatively uncommon in the aquarium trade**, making it appealing to hobbyists looking for less frequently seen crustaceans. It benefits from a layout rich in shelters, clean water and a varied diet. Like several crayfish in the genus Cherax, it should be kept with care because it may defend its territory and capture vulnerable tank mates.

General species description

Cherax peknyi is a medium-sized freshwater crayfish belonging to the genus Cherax. It is primarily bottom-dwelling and becomes more active at dusk, when it searches the substrate for food. Adults alternate between resting in shelters and moving opportunistically among rocks, roots and leaf litter. They need suitable floor space because they may become territorial, especially during moulting periods. Water quality is essential: stable, well-oxygenated water free of copper supports normal growth. Because of its **relatively limited availability**, this crayfish is best suited to aquarists looking for an unusual species rather than simply a scavenger. A structured aquarium with multiple hiding places helps reduce conflict and provides secure resting areas.

Geographical origin and biotope

Cherax peknyi comes from **New Guinea**, particularly the western part of the island administered by Indonesia, commonly called Western Papua. It inhabits inland freshwater environments associated with streams and calmer areas where the bottom provides shelter. Its natural habitat includes bank areas, stone piles, submerged wood and leaf litter. In the aquarium, this ecology calls for a structured layout, efficient filtration and moderate flow rather than intense circulation. Water can generally be maintained around **22 to 28 °C** and a **pH of 6.5 to 8.0**, with good stability and sufficient mineral content to support shell formation.

Precise location and local name

Aquarium sources associate Cherax peknyi with **Western Papua**, on the island of New Guinea, but one precise locality should not be generalized to every aquarium specimen. The English common name **Zebra Lobster** refers to its contrasting bands, while the scientific name remains the most useful designation for avoiding confusion between different New Guinean crayfish. In French, the names écrevisse zèbre and écrevisse de Nouvelle-Guinée may be encountered. Since vernacular names can be applied to several similar forms, identification by the Latin name and stated provenance is preferable when purchasing.

Appearance and physical characteristics

Cherax peknyi has an elongated body, a firm carapace and two claws used for defence, handling food and moving material around the aquarium. Its most recognizable feature is its **zebra-like coloration**, generally consisting of dark and pale bands across the body and abdomen. The antennae are long and sensitive, while the walking legs may show contrasting shades. Exact coloration varies with age, health, surroundings and lighting. Adult males may develop larger claws, while females carry eggs beneath the abdomen. An adult length of approximately **10 to 12 cm** is generally used for aquarium planning.

General diet

Cherax peknyi is an omnivore and an opportunistic feeder. It consumes plant debris, softened leaves, biofilm, sinking foods and small prey when available. In the aquarium, the staple diet should consist of **quality crayfish pellets** or sinking foods, supplemented with blanched vegetables such as zucchini, cucumber or spinach. Properly prepared catappa, oak or beech leaves can provide fibre and additional shelter. Small portions of animal protein may be offered occasionally, but excessive feeding should be avoided. Removing leftovers helps limit pollution and disputes. A regular mineral supply also supports **shell rebuilding after moulting**.

Essential data

• Native river name: Western Papua, with no single river retained here
• Local name used: Zebra Lobster
• Origin of the scientific name: Cherax is the genus name; peknyi is the specific epithet
• Etymology of the full name: Cherax designates the freshwater crayfish genus; peknyi forms the species name
• Common/vernacular names: Zebra Lobster, zebra crayfish
• Family: Parastacidae
• Name pronunciation: keh-raks - pek-nyee
• Discovery: Andreas Lukhaup, 2008
• Maximum adult size: approximately 12 cm
• Water temperature and pH: 22 to 28 °C; pH 6.5 to 8.0
• Stream appearance and surrounding vegetation: freshwater areas with rocky shelters, submerged wood and leaf litter
• Typical tank mates: sturdy snails and small, fast midwater fish, with caution
• Temperament and behaviour: fairly territorial, bottom-dwelling and mainly active at night
• Water depth: shallow to medium-depth areas associated with banks and the bottom
• Sexual dimorphism: males often have more developed claws; females are identifiable when carrying eggs
• Bottom structure and flow: gravel, stones, wood and leaves; low to moderate flow

For greater success

Success with Cherax peknyi depends on a covered, well-filtered aquarium furnished with several caves or tubes of suitable diameter. Provide a stable substrate, separate shelters and copper-free water. Regular maintenance, a varied diet and close observation during moulting are priorities. Avoid slow fish, delicate shrimp and tank mates that sleep on the bottom. With a reasonable stocking level and enough floor space, this crayfish can become a **fascinating observation animal** while retaining much of its natural behaviour.