Marbled Crayfish care guide
Marbled Crayfish (Procambarus fallax f. virginalis) — minimum tank 60 L, temperature 18-26 °C, pH 6.5-8.5.
Compiled by Aquairi from published sources · Published · Updated
Overview
Marbled Crayfish (Procambarus fallax f. virginalis) is a North-American freshwater crayfish of the family Cambaridae, listed in the Aquairi knowledge base as a beginner-level species. Parthenogenetic all-female crayfish that reproduces without males by cloning itself. Banned in EU and several countries due to invasive potential. Marble-pattern carapace.
Taxonomy
- Family: Cambaridae
- Genus: Procambarus
- Scientific name: Procambarus fallax f. virginalis
- Common synonyms: Marmorkrebs, Self-cloning Crayfish
Habitat
Procambarus is a North-American crayfish genus (Cambaridae) with hundreds of described species from the south-eastern United States, Mexico and the Caribbean. Many species occupy shallow ponds, ditches and slow streams; several have been introduced to Europe and Asia and are now widespread invasive species. The Aquairi knowledge base records this entry from: Aquarium origin (parthenogenetic mutant of P. fallax).
Tank requirements
- Minimum tank volume: 60 L (15.9 US gal)
- Adult size: 8-12 cm
- Temperature: 18-26 °C (64-79 °F)
- pH: 6.5-8.5
- GH: 6-18 °dGH
- KH: 3-12 °dKH
- Lifespan: 2-3 years
Diet
An omnivore. Diet includes plant matter, biofilm, algae, detritus and protein in the form of carrion, small invertebrates or fish remains. In the aquarium a daily portion of sinking pellet, regular blanched vegetables and occasional frozen bloodworm or shrimp meet nutritional needs and reduce intraspecific aggression.
Compatibility
Aggressive predator. Adults are large enough to catch slow bottom-dwelling fish, prey on dwarf shrimp and clip soft plants; a species-only or fast top-dwelling community is preferred. Suitable tank mates listed in the Aquairi knowledge base: Solo recommended. Should be kept away from: All fish, Shrimp, Snails, Plants.
Breeding
Marmorkrebs reproduce parthenogenetically — all individuals are female and produce viable eggs without males. A single specimen will populate a tank, and offspring are genetically identical to the mother.
Marbled Crayfish Breeding Guide
Overview
The Marbled Crayfish (Procambarus virginalis, also documented as Procambarus fallax forma virginalis) is unusual among aquarium crayfish: every individual is female and reproduces by parthenogenesis, producing offspring genetically identical to the parent. The lineage is thought to derive from the clonal descendants of a single specimen dating from around 1988, and the animals are triploid with 276 chromosomes.
Sexing
Sexing does not apply: all Marbled Crayfish are female and no males exist. Reproduction requires no mating partner, so a single isolated animal can and will produce clutches on its own.
Berried Female & Young
As in other crayfish, the female carries her eggs and then the hatchlings attached beneath her abdomen, and development is direct with no free-swimming larval stage. Because reproduction is clonal and frequent, populations can grow rapidly: a Madagascar population introduced from the aquarium trade expanded its range roughly 100-fold between 2007 and 2017 and is estimated in the millions.
Juvenile Care
Juveniles detach from the mother and become free-living. Given the clonal reproduction, even a single specimen produces large numbers of identical offspring, so any breeding quickly leads to overcrowding in a closed aquarium. Surplus animals must be contained responsibly and never given away into regions where the species is regulated.
Common Challenges
The central challenge is not getting the animal to breed but controlling it. The species is a known carrier of the crayfish-plague pathogen Aphanomyces astaci, which can be lethal to native crayfish, so escape or release poses a serious ecological risk in addition to the legal prohibitions.