Care guide · Freshwater crayfish

Yabby (Cherax destructor) care

Cherax destructor

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The yabby, Cherax destructor, is a large Australian freshwater crayfish. The name “yabby” is also used for other animals, so check the scientific name and do not confuse this species with tropical redclaw or other Cherax. The Australian Museum describes a length of about 20 cm and a broad range of ponds, lakes, rivers and temporary waters. This species digs burrows and can rearrange plants and décor. It is not a dwarf crayfish or an easy choice for a planted community aquarium. Provide broad floor area, sturdy shelters, a secure lid and stable, oxygenated water. Keep small animals out of reach.

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At a glance

Temperature: 20–25 °C
pH: 7.0–8.0
Diet: Omnivore
Adult size: Up to 20 cm
Temperament: Territorial, Predator

About this species

ITIS treats Cherax destructor Clark, 1936 as a valid species and lists Cherax davisi and C. esculus as synonyms. Colour varies with habitat and culture; blue colour alone does not prove a different species. Trade names such as “yabby” may be used more broadly. Ask for the scientific name and reliable provenance when buying.

Natural habitat

The species is native to parts of eastern Australia, including the Murray–Darling region. Museum and government sources describe ponds, farm dams, lakes, rivers and creeks. Yabbies can survive drought in deep burrows and move across wet land. They have been introduced outside their native range and can displace local crayfish there. Never release animals, eggs, aquarium water or wet equipment into nature.

Aquarium and layout

Choose a spacious aquarium with a broad open floor; a defensible minimum volume is not well established, so none is stated. Adults may reach about 20 cm. Provide several sturdy burrows or shelters and place rocks securely so digging cannot cause a collapse. A tight, weighted lid is essential because crayfish can climb cables or décor and escape. Protect filter intakes and use reliable biological filtration. Rooted plants and fragile décor may be dug up or damaged.

Water conditions

Government and aquaculture references give 20–25 °C as an ideal production temperature; this is not a proven aquarium boundary. An Australian aquarium profile recommends pH 7–8. Keep parameters stable, prevent measurable ammonia and nitrite, and avoid abrupt temperature changes. The species can survive more extreme conditions in nature, but that does not make them desirable for long-term aquarium care. A precise GH/KH target was not sufficiently confirmed.

Behaviour and group size

This crayfish is large, actively digs and may defend shelters. It can catch slow-moving or resting animals and damage plants. A species-only aquarium is the most predictable. Keeping fish together does not guarantee safety, and small shrimp or snails may be at risk. Add several shelters and observe daily; separate animals if injuries, repeated chasing or tankmate losses occur.

Feeding

Government and aquarium sources describe an omnivorous scavenging diet with animal and plant matter. Offer small portions of suitable sinking food and vegetables, and remove leftovers before they affect water quality. No product from the central catalogue is linked: composition and suitability for this large crayfish could not be confirmed product by product.

Breeding

Yabbies can mature quickly and reproduce during suitable warm periods. The female carries eggs under the abdomen, and the young hatch as miniature crayfish. Timing and numbers vary with temperature and population, so a fixed schedule is not justified. Provide extra small shelters for juveniles and protect them from adults and filter intakes. Never transfer animals or eggs to outdoor waters.

Keeping with fish

The neon tetra (Paracheirodon innesi) is discouraged as a default tankmate. An adult yabby may reach about 20 cm and sources warn that slow or resting fish can be caught. This exact pairing has not been tested; the rating is cautious and risk-based.

Keeping with other invertebrates

Small shrimp and snails may be caught or injured. Anubias is suitable conditionally when its rhizome is securely attached to wood or rock; digging and clawing can still damage it. This is not a tested pairing.

Exoskeleton, shell and minerals

During moulting the crayfish is temporarily soft and vulnerable. Leave it undisturbed and leave the shed shell unless it fouls the water; the crayfish may eat it. Provide several deep shelters and stable water. Repeated problems warrant checking temperature, calcium availability, oxygen and water quality; do not add minerals or treatments without measurements.

Possible problems

Key risks include escape, décor collapse from digging, plant damage, predation and water pollution from leftover food. Copper-based treatments can harm crayfish. This species may cause ecological harm outside its native range. Check local possession and transport rules, which vary by country and region. Never release aquarium animals or water into streams, lakes or ponds.

Sources & review

This care guide draws on several specialist sources and was last checked on 18 October 2026.

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