Aransas Dwarf Crawfish (Cambarellus ninae)
| Aransas Dwarf Crawfish Cambarellus ninae | |
|---|---|
 | |
| Name | Aransas Dwarf Crawfish |
| Name Lat. | Cambarellus ninae |
| Family | Crayfish |
| Family lat. | Cambaridae |
| Order | Decapoda |
| Order lat. | Decapoda |
| Origin | North America |
| Habitat | Streams, pools, ditches |
| Diet | Omnivore |
| pH | 6.5-8.0 |
| Behavior | Semi-aggressive |
| Keeping | Individual, pair, group |
| Care Level | Moderate |
| Reproduction | Oviparous |
| Breeding | Moderately difficult |
| Life Span | 2-3 years |
| Protection | No |
| Metric Units | |
| Size | 3.5 cm |
| Temperature | 18-24 °C |
| Hardness | 5-15 °dH |
| Aquarium | 30 l |
| US Units | |
| Size | 1.4" |
| Temperature | 64-75 °F |
| Hardness | 89-267 ppm |
| Aquarium | 10 gal |
Distribution and habitat
The range of the Nina's dwarf crayfish extends from Arkansas to Texas (USA). They live mainly in shady pools and ponds with dense vegetation, usually located in the catchment area of larger streams and rivers.
Maintenance
They need a well-structured aquarium with roots, stones and plants, plus caves or crab tubes as hiding places 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 foods such as cyclops, daphnia and artemia, which are also accepted in frozen form, as well as food tablets, granulated and flake foods. Occasionally, plant 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 is only recommended in a much larger and richly structured tank. They can be socialized with shrimps, snails and smaller peaceful fish, but it is better to keep them in a species tank.
Basically, only compatible animals with similar demands on water quality and water temperature should 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, shortly after molting, the female is turned onto her back by the male, which transfers a sperm package with its gonopods. The female carries the eggs (20-60 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
It can happen that a dwarf crayfish is missing a claw. Usually these are females that have lost a claw during mating. The missing claw slowly grows back during the following molts.
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