Fauna
Invertebrate

Marbled Crayfish

Procambarus virginalis

Also known as Marmorkrebs, Self-Cloning Crayfish

Marbled crayfish are unique all-female decapod crustaceans that reproduce exclusively through self-cloning, meaning every individual is genetically identical to its parent. Originally discovered in the German aquarium trade, they have rapidly established wild populations across Europe, Asia, and Africa due to aquarium releases. Their high adaptability and explosive reproductive rate make them a formidable threat to freshwater ecosystems worldwide.

InvasiveParthenogeneticFreshwater
Marbled Crayfish reference
(c) Chucholl C., some rights reserved (CC BY-SA) · cc-by-sa
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyAquatic plants, Detritus, Small invertebrates
Predators
  • Predatory fish
  • Herons
  • Raccoons
ThreatsEradication efforts in introduced ranges, though they face no threat of extinction
HabitatsLakes, ponds, slow-moving rivers, swamps, and ditches
Life span2 to 3 years
Classification
  1. FamilyCambaridae
  2. SpeciesProcambarus virginalis
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Capable of pinching with their claws; handle with care to avoid minor pinches.
Responsible observation
  • Do not release: Never release aquarium specimens into the wild as a single individual can start a new population.
  • Handling: Pick them up gently from behind the carapace to avoid their small but sharp claws.
  • Reporting: Report any wild sightings to local environmental authorities to help track invasive spread.
Related species
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