Care guide · Freshwater crayfish

Redclaw crayfish care

Cherax quadricarinatus

Male. Photo: MOs810, CC BY-SA 4.0. Photo: MOs810 · Source · CC BY-SA 4.0No crop, recolour or compositing; proportional resize and format derivatives by the established media workflow. Visible credit and CC BY-SA 4.0 retained.

The Australian redclaw, Cherax quadricarinatus, is a large tropical freshwater crayfish from northern Australia and southern Papua New Guinea. Adults can reach about 25 cm, so this is not a small aquarium crayfish. Mature males often develop a conspicuous red patch on the outer claw, but colour alone is not reliable species identification. Queensland Government describes the species mainly in pond aquaculture and reports warm, stable conditions. Those production values are not automatically proven aquarium limits. In a home aquarium, space, oxygenation, shelters, secure décor and a tight-fitting lid are essential. Small fish and invertebrates may be at risk.

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At a glance

Temperature: 24–29 °C
pH: 7.0–8.5
Diet: Omnivore
Adult size: Up to 25 cm
Temperament: Territorial

About this species

ITIS accepts Cherax quadricarinatus (von Martens, 1868); Astacus quadricarinatus is the original combination. Common names include redclaw, Queensland redclaw and Australian redclaw crayfish. Do not confuse it with the yabby Cherax destructor: both belong to Cherax but differ in range and habitat. The red claw patch is most characteristic in mature males.

Natural habitat

Government sources place the native range in tropical Queensland and the Northern Territory; USGS also includes southeastern Papua New Guinea. The species inhabits freshwater creeks, billabongs, lakes and lagoons, often in slower water. Native and introduced populations must be distinguished: redclaw has been recorded outside its original range in several places. Never release animals, eggs, aquarium water or wet equipment into nature.

Aquarium and layout

Choose a spacious aquarium with a broad floor and several sturdy shelters for resting and moulting. A precise minimum volume is not sufficiently supported, so none is stated. An adult length of about 25 cm still calls for generous open space. Redclaw digs less than many crayfish but may move décor and plants. Secure rocks and wood and protect filter intakes. Use reliable biological filtration and good aeration. Seal the aquarium completely because crayfish can escape.

Water conditions

Queensland Government gives 26–29 °C as the optimal growth range in production and pH 7–8.5. A specialist aquarium profile recommends 24–27 °C; this overlap is used as practical guidance, not an experimentally established aquarium tolerance. Keep water oxygenated and stable, and prevent measurable ammonia and nitrite. Abrupt changes may disrupt moulting. Reliable general GH/KH targets were not established.

Behaviour and group size

The species is described as relatively non-aggressive and non-burrowing in natural habitat, but a large animal may behave differently in an aquarium and catch vulnerable tankmates. Provide several shelters, allow for shelter defence and observe after introduction. A species-only aquarium is the most predictable. Do not add small or slow fish, shrimp or snails without assessing the risks.

Feeding

Government sources describe pellets in pond production and an omnivorous detrital diet. In an aquarium, offer small portions of suitable sinking food and plant matter; remove leftovers to prevent fouling. No central-catalog product is linked: pond-production feed is not automatically suitable aquarium food, and no individual item could be verified reliably.

Breeding

According to Queensland Government, reproduction depends on water temperature and daylight. Females brood eggs for about six to ten weeks depending on temperature. Hatchlings remain attached under the female for a time before becoming more independent. Pond production figures do not guarantee home-aquarium results. Provide fine shelters and protect juveniles from larger crayfish and filter intakes.

Keeping with fish

The neon tetra (Paracheirodon innesi) is discouraged as a default tankmate. Redclaw can reach about 25 cm and neon tetras are much smaller. Capture is possible, but this exact pairing has not been tested; the rating is a cautious risk assessment.

Keeping with other invertebrates

Small shrimp and snails may be caught. Anubias is suitable conditionally when its rhizome is secured to wood or rock; feeding or rearrangement may still damage it. This exact species–plant pairing has not been tested.

Exoskeleton, shell and minerals

After moulting, the shell is temporarily soft. Leave the crayfish undisturbed, provide several shelters and prevent other animals from reaching it. Leave a shed shell if it does not affect water quality; crayfish may recover minerals from it. If problems recur, check temperature, oxygen, calcium and water quality instead of adding minerals at random.

Possible problems

Common risks include escape, injury around moulting, predation on small tankmates, plant damage and water pollution from leftovers. Copper-based treatments can harm crayfish. The species has been introduced in several places beyond its native range; never transport or release it. Check local possession and transport rules, which vary by country and region.

Sources & review

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

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