Yabby (Cherax destructor albidus)
| Yabby Cherax destructor albidus | |
|---|---|
 | |
| Name | Yabby |
| Name Lat. | Cherax destructor albidus |
| Family | Southern Hemisphere Crayfishes |
| Family lat. | Parastacidae |
| Order | Decapods |
| Order lat. | Decapoda |
| Origin | Australia |
| Habitat | Streams, lakes, swamps |
| Diet | Carrion, leaves, crayfish food |
| pH | 7.0-8.0 |
| Behavior | Semi-aggressive |
| Keeping | Individual, pair, group |
| Care Level | Moderate |
| Reproduction | Oviparous |
| Breeding | Moderately difficult |
| Life Span | 5-7 years |
| Protection | No |
| Metric Units | |
| Size | 15-20 cm |
| Temperature | 12-25 °C |
| Hardness | 5-20 °dH |
| Aquarium | ~ 200 l |
| US Units | |
| Size | 6"-8" |
| Temperature | 54-77 °F |
| Hardness | 89-356 ppm |
| Aquarium | ~ 50 gal |
Distribution and habitat
The range of the Australian crayfish in Australia extends throughout Victoria and New South Wales to the Northern Territory areas. They live in stagnant and slow-flowing, usually turbid waters with dense vegetation. They are also often found in channels and swamps.
Maintenance
They need a well-structured aquarium with roots, stones and robust plants, with hiding places (caves, crab tubes) and a moderate current. The substrate should be sand or gravel, partially covered with foliage (e.g. sea almond leaves, oak leaves).
No ammonia, ammonium and nitrite should be detectable in the aquarium water, the nitrate value should not exceed 100 mg/l. To ensure water quality and oxygen content, a filter and heater adapted to the size of the aquarium is required, as well as lighting for the species-appropriate day-night rhythm of the animals. When choosing the filter, special care should be taken to ensure that the animals cannot be sucked in.
Diet
They feed on animal organisms, carrion and dead plant material. They prefer live food, such as daphnia, artemia and fish, which is also accepted in frozen form, as well as foliage (e.g. oak, beech, maple, birch), food tablets, granulated and flake food. Occasionally, vegetable food in the form of spirulina, kelp or scalded leafy vegetables should be offered.
Regular and varied feeding promotes health and prevents deficiency symptoms. Unaccepted food must be removed after 2-3 hours.
Behaviour and compatibility
They behave little aggressive within the species, but also towards other crayfish. Keeping several pairs or groups should only be done in a much larger and richly structured tank. They can only be socialized with large shrimps, snails and large fish, such as perches, but it is better to keep them in a species tank.
Basically, only mutually compatible animals with similar demands on water conditions and water temperature may be socialized.
Reproduction and breeding
Males can be identified by the gonopods (mating styli) on the abdomen of the underside of the body. During mating, the male turns the female onto her back shortly after her molt and transfers a sperm package with his gonopods. The female carries the eggs (30-40 of them) on her pleopods (webbed feet) and supplies them with oxygen by movement (fanning). Dead or non-developing eggs are eaten by the female. The young hatch after about 4 weeks.
Important
The Cherax destructor albidus is a subspecies of the yabbie. They are lighter colored, the joints of the claws are red and blue metallic at the tips.
It can happen that a crayfish is missing a claw. This is usually females that have lost a claw during mating. The missing claw slowly grows back during the following molts. The strong claws are also used for digging.
The well-being of the animals should be checked regularly. Temperature should be checked daily, pH, hardness and nitrate levels at least every 14 days. Regular partial water changes are recommended, even if the contaminant level has not yet reached the upper limit. Sudden changes in water quality should be avoided. Newly introduced animals must be accustomed slowly to the water in the aquarium.
Further literature can be found in your pet store.
References
Text: Barbara Pachner; Image: Franz Lowak
Source: LUKHAUP & PEKNY (2008): Süßwasserkrebse aus aller Welt, Dähne Verlag; ENGELMANN & LANGE (2011): Zootierhaltung - Tiere in menschlicher Obhut: Wirbellose, Verlag Harri Deutsch