Australian red claw crayfish

Water parameters

Minimum tank: 200 L per individual at harvest size.

Feed and growth

Feed protein

28% target

Daily feed (warm)

2.00% of body weight

Daily feed (cool)

0.80% of body weight

Max density

30 g per litre

A 200 g adult eats about 4.0 g of feed per day at optimum. 10 fish at adult size: ~40 g daily.

Legality

Rules vary by jurisdiction and change over time. Verify with your local fisheries or wildlife authority before stocking.

Unlisted jurisdictions default to "check local regulations".

Origin and habitat

Native to freshwater rivers, creeks, and billabongs in tropical northern Australia and Papua New Guinea. The species (Cherax quadricarinatus) is named for the red patch (or claw) on the outer surface of the male's large claws. Red claw are the most widely cultured freshwater crayfish in tropical and subtropical regions worldwide, with production in Australia, Central America, Southeast Asia, Africa, and parts of the US (primarily Florida and Hawaii). Adults reach 25–30 cm and 200–600 g, making them the largest tropical freshwater crayfish commonly available for aquaculture. The flesh is sweet, firm, and similar to marine lobster, commanding $15-40/kg depending on market and size grade. Red claw tolerate warm water (20–32°C) and have a simpler lifecycle than freshwater prawns (no larval brackish-water stage), which makes them easier to breed in captivity.

Climate and outdoor ponds

Climate

tropical (needs warm water year-round)

USDA zones

9–13 (winter low around -7°C or warmer)

Heating needed

yes

Cooling needed

no

Care notes

The leading freshwater crayfish for tropical and subtropical aquaponics. Red claw grow to market size (100–200 g) in 6-9 months at 26–30°C, faster than most temperate crayfish species. FCR on crayfish pellet (28-35% protein) is 1.8-2.5. Stocking is calculated by bottom area: 10-20 crayfish per square meter. They need shelter structures (bundles of nylon mesh, PVC pipe sections, or stacked tiles) to reduce aggression and provide protection during the vulnerable post-molt period. Red claw are less aggressive than many crayfish species, which allows higher stocking densities than yabbies or marron. They breed readily in captivity: females carry 300-800 eggs under the abdomen, and juveniles are fully independent miniature crayfish at release (no larval stage requiring special care). This easy breeding means a colony can be self-sustaining, producing its own replacement stock. Water quality: DO above 3 mg/L, ammonia below 1 mg/L, pH 6.5-8.5. Temperature below 15°C causes mortality. Legal status varies: in Australia, red claw culture is permitted in Queensland and the Northern Territory but restricted in some southern states. In the US, legal in Florida and Hawaii but restricted or prohibited in several other states due to invasive concerns. Fingerlings are available from crayfish hatcheries in Australia, the US, and several tropical countries.

Further reading

• Aquaponics water chemistry: balancing pH for fish and plants
• Fish for aquaponics: tilapia vs everything else