Swamp Dwarf Crayfish

Cambarellus puer

Animalia›Arthropoda›Malacostraca›Decapoda›Cambaridae

📍 North America

A small dwarf crayfish from the swamps and lowland streams of the southeastern United States, reaching about 1.2 inches with variable mottled brown and grey patterning that camouflages it among leaf litter. It is peaceful with fish and large invertebrates and thrives in heavily planted tanks with leaf litter and hiding spots at room temperature.

Size1.4"

Min Tank10g

peaceful

Zonebottom

Care Guide

Diet

Swamp Dwarf Crayfish are omnivorous scavengers that feed on detritus, decaying plant matter, and small organisms in the substrate. Supplement their natural foraging with sinking pellets, blanched vegetables (zucchini, spinach), and occasional frozen foods like bloodworms or brine shrimp 2-3 times weekly. They will also consume algae wafers and benefit from leaf litter that provides natural grazing opportunities.

Behavior

These crayfish are nocturnal and spend most of the day hiding among plants, leaf litter, and décor, becoming more active at dusk and night. They are peaceful and solitary, showing minimal aggression toward tank mates despite being opportunistic predators of very small organisms. They are relatively sedentary compared to larger crayfish species and prefer to forage along the substrate rather than actively hunt.

Breeding

Breeding Swamp Dwarf Crayfish in captivity is possible but uncommon in home aquariums. Females produce small clutches of 10-20 eggs that they carry under their tail; fry are released as miniature adults and require abundant hiding spots and infusoria or liquid fry food. Success requires stable conditions, plenty of vegetation, and patience, as breeding is not reliably triggered in captivity.

Tank Mates

Otocinclus

Small, peaceful algae eaters with similar water parameters and bottom-dwelling habits; no predatory threat to crayfish

excellent

Emerald Dwarf Rasbora

Tiny, peaceful fish that occupy mid-water column and avoid crayfish; thrive in cool, planted tanks

excellent

Red Cherry Shrimp

Similar size and peaceful nature; may occasionally be predated upon if very small, but generally compatible in planted tanks

good

Ramshorn Snail

Peaceful detritivores that share the same ecological niche; no conflict with crayfish

excellent

Java Moss

Provides essential hiding spots, foraging surfaces, and shelter that crayfish require; improves water quality

excellent

Anubias Nana

Hardy, low-light plant that creates habitat structure; crayfish will not uproot or destroy it

excellent

Common Diseases

Shell Rot (Bacterial Infection)

Symptoms

Soft spots, discoloration, or pitting on the exoskeleton; lethargy and reduced feeding

Treatment

Improve water quality with frequent partial water changes, remove decaying food/plants promptly, and maintain stable parameters. Isolate severely affected individuals and consider antibacterial treatments if available for invertebrates

Parasitic Infections

Symptoms

Visible parasites on body, excessive molting, loss of appetite, and erratic behavior

Treatment

Perform water changes and improve tank hygiene; quarantine affected crayfish if possible. Avoid copper-based treatments as crayfish are highly sensitive; focus on environmental management

Molting Problems

Symptoms

Difficulty shedding exoskeleton, incomplete molts, or death shortly after molting

Treatment

Ensure adequate calcium and minerals through varied diet and quality substrate; maintain stable water parameters and pH above 6.5. Provide ample hiding spots to reduce stress during vulnerable molting periods

Fungal Infections

Symptoms

White or grey fuzzy growth on body or appendages, particularly after injury or poor water conditions

Treatment

Improve water quality and remove decaying organic matter; increase water changes. Isolate affected individuals and maintain pristine conditions; antifungal treatments designed for invertebrates may help if available