Yabby

The Yabby (Cherax destructor) is one of Australia's most widespread native freshwater crayfish, found across a vast inland range in NSW, Victoria, South Australia, Queensland and the NT. They inhabit lakes, rivers, streams, irrigation channels, farm dams and swamps. The species name 'destructor' reflects their prolific burrowing habit, which can damage dam walls and irrigation banks.

Yabbies are enormously hardy, tolerating extremely wide temperature ranges (5-35ºC), drought through aestivation in dried mud, and broad water chemistry variation. These characteristics make them one of the most robust native aquatic animals available to Australian keepers.

Yabbies are native Australian animals and the most commonly available crayfish in the Australian pet trade, also available from bait shops. Licensing requirements vary between states and may change: always confirm current requirements with your state wildlife authority before purchasing.

Minimum tank: 60 litres for a single adult; 100-150+ litres for pairs or small groups. Provide multiple hiding spots (smooth ceramic pipe, PVC elbows, commercial crayfish caves, stacked smooth rocks) as Yabbies are territorial and need refuge, especially during post-moult vulnerability.

Yabbies burrow enthusiastically in fine sand or fine gravel 5-10 cm deep. A bare-bottom tank is also acceptable and makes cleaning easier. Filtration must be robust: a filter rated for 1.5-2 times the tank volume. Cover all filter intakes with mesh guards. A secure, well-fitting lid is essential as Yabbies are competent climbers.

Temperature tolerance is very wide; no heater is required in most Australian homes. Yabbies must not be kept with small fish or shrimp, which they will catch and eat.

Yabbies are opportunistic omnivores and will consume algae, detritus, aquatic plants, worms, small invertebrates, dead fish and virtually any organic matter. Feed quality sinking crustacean pellets as the dietary foundation, supplemented with blanched vegetables (zucchini, carrot, sweet potato, leafy greens, spinach), fresh fruit, earthworms and small prawns. Remove uneaten food within 24 hours.

Calcium is critical for moulting and claw health. Provide a cuttlebone in the aquarium and ensure the water is not too soft (hardness below 50 ppm can impair moulting). Avoid overfeeding: yabbies have small stomachs and will stop eating when full.

Yabbies can be gently picked up for health checks or transfers, but their claws can pinch: handle carefully and avoid being nipped. They display territorial and defensive behaviour (raising claws in warning) that is fascinating to observe. Pick up from behind, grasping the body above the tail section. A recently moulted Yabby must never be handled as the soft exoskeleton is extremely vulnerable. Always wash hands after handling Yabbies or tank water.

Provide a varied physical environment with different hiding structures, substrate areas, rocks and driftwood for exploration. Varying feeding items on rotation provides foraging enrichment and better nutrition. For an enriched naturalistic setup, a biotope mimicking an Australian waterhole (silty substrate, smooth pebbles, weathered driftwood, minimal planting) provides the most authentic environment. Live plants will generally be eaten or uprooted; hardy plants attached to rocks or driftwood (java fern, anubias) may survive better.

Moulting complications: Failed moulting is caused by calcium deficiency or incorrect water chemistry. Ensure calcium availability through varied diet, cuttlebone and appropriately hard water.

Aggression injuries: Two Yabbies in close quarters will fight; provide multiple hides and monitor closely.

Bacterial infections: Can affect Yabbies under poor water quality conditions.

Copper toxicity: Yabbies are sensitive to copper; use copper-neutralising water conditioner and avoid copper-based medications.

Ammonia and nitrite toxicity: Can rapidly impair health; maintain a cycled tank and regular water changes.