Yabby

Quick facts

Adult size

15 cm, 100 g typical harvest weight

Days to harvest

365 to 730 days from fingerling

Lifespan (max)

up to 7 years

Diet

omnivore

Temperature class

cool-water

Difficulty

intermediate

Water parameters

Temperature range

5–32°C (optimum 22°C)

pH

6.5 to 8.5

Hardness

5 to 25 dGH

Minimum tank

150 L per individual at harvest size

Feed and growth

Feed protein

28% target

Daily feed (warm water)

1.80% of body weight per day

Daily feed (cool water)

0.70% of body weight per day

Max stocking density

25 g per litre of system water

A 100g adult eats about 1.8 g of feed per day at optimum temperature. For a roster of 10 fish at adult size, that's around 18 g of feed daily.

Legality

Aquaculture and possession rules vary by jurisdiction and change over time. This table reflects regulations as of the verified date on each row. Verify with your local fisheries or wildlife authority before stocking.

Jurisdictions not listed here default to "check local regulations". A non-listing is not a green light; rules in your specific county or municipality may apply.

Habitat and origin

Native to freshwater rivers, creeks, farm dams, and temporary water bodies across southeastern Australia, from South Australia east through Victoria, New South Wales, and into Queensland. The common yabby (Cherax destructor) is the most familiar freshwater crayfish to Australians and an iconic part of rural Australian culture. The species tolerates an extraordinary range of conditions: temperatures from near-freezing to 35°C, low dissolved oxygen, high turbidity, and temporary dewatering (they burrow into mud and survive for months in sealed burrows during drought). Adults reach 15–20 cm and 50–150 g, though most pond-cultured yabbies are harvested at 30–80 g. The flesh is sweet and firm, comparable to marine prawns. Colors range from blue to olive-brown to near-black depending on water chemistry.

Climate and outdoor ponds

Climate classification

temperate (handles seasonal swings)

Outdoor pond zones (USDA)

4 to 11 (winter low around -34°C or warmer)

Heating in a temperate climate

Not required (handles seasonal cool periods)

Cooling in a temperate climate

Not required

Zone bounds reflect year-round outdoor pond viability with no active heating. Anywhere outside the bounded zone, the species can still be kept in an indoor heated tank or a seasonally-managed system. Verify your specific microclimate, as a sheltered yard zone can run a half-zone warmer than the regional rating.

Care notes

The most commonly cultured freshwater crayfish in Australia and a practical choice for temperate Australian aquaponics. Temperature range: 5–35°C, with optimal growth at 20–28°C. Growth: 30–80 g in 6-12 months on commercial yabby or crayfish pellet (25-32% protein) or on a diet supplemented with vegetable scraps, grain, and detritus. FCR on pellet is 2.0-3.5, typical for crayfish. Stocking: 10-20 yabbies per square meter of bottom area. Shelter is essential: bundles of PVC pipe, nylon mesh, or stacked tiles reduce aggression and provide protection during vulnerable post-molt periods. Yabbies are burrowers; in pond culture, this can damage levee banks. In tank-based aquaponics, the burrowing instinct is managed by providing appropriate shelter alternatives. Water quality tolerance is broad: DO above 2 mg/L (they tolerate very low oxygen), pH 6.5-9.0, moderate ammonia tolerance. Yabbies breed readily: females carry 100-1000 eggs under the abdomen, and juveniles are fully independent at release. Population management is necessary to prevent overcrowding. Fingerlings (or broodstock) are available from yabby farms and bait suppliers across southeastern Australia. Legal throughout their native range. Market value is moderate ($10-25/kg) and seasonal (highest in summer when recreational fishing demand peaks). For Australian aquaponics operators, yabbies offer a hardy, low-maintenance crustacean with strong cultural recognition.

Further reading

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