Cherax Destructor Yabby Care Guide: Common Yabby Husbandry

The yabby is one of Australia’s most adaptable freshwater crayfish, but its preference for cool water makes it a tricky proposition in tropical Singapore. This cherax destructor yabby care guide from Gensou Aquascaping at 5 Everton Park covers Cherax destructor — a robust 18cm species that wild-thrives at 18 to 22°C and almost always needs a chiller in an HDB flat. Get the temperature right and the rest is easy; ignore it and the animal will fail to moult, refuse food and die within months.

Quick Facts

• Scientific name: Cherax destructor
• Adult size: 15 to 20cm, occasionally 25cm in pond conditions
• Minimum tank: 120 litres for one, 200 litres for a pair
• Temperature: 18 to 22°C ideal, will tolerate brief excursions to 26°C
• Water: pH 7.0 to 8.5, GH 8 to 20, KH 5 to 12
• Lifespan: 4 to 7 years
• Chiller required in Singapore — ambient 28°C is too warm long-term

Why Yabbies Need a Chiller in Singapore

Unlike the tropical redclaw, C. destructor evolved across the temperate inland river systems of southeast Australia, where summer water rarely exceeds 24°C. Sustained temperatures above 26°C suppress appetite, accelerate metabolism and cause repeated failed moults. A 1/10 HP aquarium chiller paired with an insulated tank lid will hold a 150-litre setup at 22°C using around 2 kWh per day. Without one, do not buy this species.

An alternative for keepers with a spare bedroom is air-conditioning at 23 to 24°C running 24/7, which often works out cheaper than a dedicated chiller for small setups but locks down room access.

Tank Setup

Footprint of 90 by 45cm minimum. Sand or fine gravel substrate, multiple caves, PVC sections, slate piles and large driftwood. Yabbies dig more aggressively than redclaws — assume the substrate will be rearranged daily. Plants are pointless. A weighted, gap-free lid is essential because they climb cables and silicone seams to escape.

Filtration should be heavy and quiet. Canister filters work well; in-tank powerheads are at risk of having their cables severed. Ensure the chiller’s flow path matches the canister’s rated GPH.

Water Parameters

Yabbies tolerate hard, alkaline water better than most crayfish — they evolved in mineral-rich Australian rivers. Singapore PUB tap should be remineralised to GH 12 and KH 6 minimum, with a small bag of crushed coral in the filter providing long-term buffering. Weekly 25 to 30 percent water changes maintain nitrate below 20ppm. Match new water temperature to within 1°C of the tank to avoid shock-induced moult failures.

Feeding

Omnivorous and undemanding. Sinking pellets, frozen prawn, mussel, earthworm, blanched zucchini, blanched spinach and the occasional pellet feeder fish round out a balanced diet. Calcium intake is critical — keep cuttlebone in the tank at all times. Adult yabbies eat surprisingly little; a tablespoon of mixed protein and veg every other day suits a single 18cm animal.

Sexing and Breeding

Sexing is straightforward. Females have gonopores at the base of the third pair of walking legs; males at the fifth, often with small claspers. Mature males have proportionally larger claws. Breeding requires a temperature drop to 18 to 20°C followed by gradual warming to 22°C to simulate spring. Females carry 200 to 500 dark eggs under the tail for three to four weeks, releasing fully formed 6mm juveniles. Without the cold cue, captive-bred yabbies in tropical climates often skip a season entirely.

Moulting

Adults moult every two to four months at correct temperature, less frequently in warm tanks. The process is the most vulnerable moment in a yabby’s life — provide caves, leave the cast shell for re-ingestion and resist the urge to remove the limp animal for “safety”. Failed moults almost always indicate too-warm water, soft water, or both.

Tank Mates

Best kept solitary or as a single sexed pair in a large enough tank. Yabbies will catch slow fish, plecos, corydoras and any shrimp they can corner. Fast mid-water schools are tolerable but expect occasional losses. Mixing with redclaws or other large crayfish is asking for fatal fights.

Singapore Sourcing and AVS

Yabbies are sold legally in Singapore both as ornamentals and as live food, with juveniles around $10 to $20 and adults $30 to $60. As with every non-native crayfish, AVS prohibits release into local waterways and storm drains. The species is highly adaptable and could establish in cooler reservoirs — never dump unwanted stock. Rehome through hobby groups or, in last resort, freeze humanely.

Common Problems

Nine out of ten yabby deaths in Singapore tanks trace to chronic overheating. Symptoms include loss of appetite, hunched posture, repeated incomplete moults and limb loss. The fix is always the same: cool the tank to 22°C and hold it there. Other issues — fungal joint infections, missing legs from cohabitant fights, sudden ammonia spikes after a heavy feed — are all secondary to temperature management.

Related Reading

• Cherax Quadricarinatus Redclaw Care
• CPO Dwarf Crayfish Care Guide
• Electric Blue Crayfish Care Guide
• Blue Crayfish Care Guide
• Marbled Crayfish Care Guide