Marmorkrebs Crayfish

Procambarus virginalis

Also known as Marbled Crayfish, Marmorkreb

Animalia›Arthropoda›Malacostraca›Decapoda›Cambaridae

Marmorkrebs are parthenogenetic crayfish that clone themselves, making them easy to breed and maintain in captivity. These small, marbled crayfish are popular for their hardiness and interesting behavior, though they can become overpopulated quickly if not managed. They are excellent scavengers and add activity to any freshwater aquarium.

Where it's from

Recorded as introduced in Belgium, Israel, Madagascar, Malta and 3 more places

At a glance

Size: 1.5 in; 4 cm
Min tank: 10 gal; 38 L
Temp: 64–82°F; 18–28°C
pH: 6.5-8.0
GH: 71–143 ppm; 4–8 dGH
Temperament: Semi-aggressive
Swims: Bottom
Lifespan: 3-5 yrs

Ammonia 0 ppm and nitrate under 20 ppm.

Care

Diet

Marmorkrebs are opportunistic omnivores that consume algae wafers, blanched vegetables (zucchini, spinach), sinking pellets, and biofilm. They scavenge decaying plant matter and leftover food, making them excellent cleanup crew members. Supplement with protein-rich foods like bloodworms or shrimp pellets 2-3 times weekly.

Behavior

Marmorkrebs are primarily nocturnal and spend much of their time foraging along the substrate and hiding in caves or plants. They are solitary and territorial, though juveniles may tolerate each other briefly. They molt regularly as they grow, becoming vulnerable during this period and requiring hiding places.

Breeding

Marmorkrebs reproduce through parthenogenesis (asexual reproduction), meaning females clone themselves without males. A single female can produce hundreds of offspring over her lifetime, leading to rapid population explosions in established tanks. Breeding occurs continuously in suitable conditions, so population control through regular removal of juveniles is essential.

Tank mates

See all 5

Otocinclus

Small, peaceful algae eaters that occupy different tank zones and avoid crayfish

good

Amano Shrimp

May be preyed upon by larger marmorkrebs; only suitable with very small individuals

caution

Java Moss

Provides hiding places and biofilm for crayfish while being hardy enough to withstand grazing

excellent

Anubias Nana

Tough plant that crayfish cannot easily uproot; provides shelter and foraging surfaces

excellent

Dwarf Hairgrass

Low-growing plant that creates habitat complexity without being easily destroyed

good

Prohibited in: IL, MI, MO, OH, TN

Not legal advice, and possibly incomplete or out of date. Rules vary by state and change over time; check with your state wildlife or agriculture agency before buying, keeping or shipping it.

The care information here is written with AI help, so it can contain mistakes. Spot one? Tell us and we'll fix it. Native range: Waarnemingen.be / observations.be (CC BY 4.0); Checklist of Freshwater Non Native Species of Spain (CC0); Global Register of Introduced and Invasive Species (CC BY 4.0); Checklist of introduced taxa in Romania (CC BY 4.0); Dyntaxa. Svensk taxonomisk databas (CC0).