Dwarf Mexican Brown Crayfish

Cambarellus montezumae

Animalia›Arthropoda›Malacostraca›Decapoda›Cambaridae

📍 Mexico

A small dwarf crayfish from the high-altitude lakes and rivers of central Mexico, displaying a warm brown to olive coloration with fine patterning and reaching about 1.5 inches. It is generally peaceful with fish too large to catch and prefers cooler water temperatures (65–74°F) reflecting its highland native habitat.

Size1.6"

Min Tank10g

peaceful

Zonebottom

Care Guide

Diet

Dwarf Mexican Brown Crayfish are omnivorous scavengers that feed on sinking pellets, algae wafers, and blanched vegetables like zucchini and spinach. Supplement with frozen foods such as bloodworms or brine shrimp 2-3 times weekly. Feed small amounts daily, removing uneaten food after 24 hours to maintain water quality.

Behavior

These crayfish are primarily nocturnal and spend most of their time foraging along the substrate and exploring hiding spots. They are generally peaceful toward fish too large to be considered prey, but will scavenge dead organisms and detritus. They are solitary and territorial toward other crayfish, so they should be housed individually unless in very large tanks with abundant shelter.

Breeding

Breeding in captivity is possible but uncommon in home aquariums. Females produce small clutches of 20-30 eggs and exhibit maternal care, fanning and protecting eggs under their abdomen for 3-4 weeks. Providing dense vegetation, stable cool temperatures (65-70°F), and excellent water quality increases breeding success, though larvae are difficult to rear.

Tank Mates

Otocinclus

Similar size and peaceful temperament; both are bottom dwellers that coexist without conflict

excellent

Emerald Dwarf Rasbora

Small, fast-moving fish that avoid the crayfish; prefer similar cool water temperatures

good

Ramshorn Snail

Peaceful invertebrate that shares the bottom zone; crayfish rarely predate on healthy snails

good

Japanese Ricefish

Small, hardy fish that tolerate cool water and occupy mid-water column away from crayfish

good

Dwarf Gourami

Can coexist if tank is large enough (20+ gallons) with ample hiding; monitor for aggression

caution

Common Diseases

Shell Rot (Bacterial Infection)

Symptoms

Soft spots, discoloration, or pitting on the exoskeleton; lethargy and loss of appetite

Treatment

Improve water quality immediately, perform 25% water changes weekly, and provide clean hiding spots. Treat with antibacterial medication if condition worsens; ensure pH and temperature remain stable

Parasitic Infection

Symptoms

Excessive molting, visible parasites on body or gills, erratic behavior, weight loss

Treatment

Quarantine affected crayfish and treat with antiparasitic medication. Perform frequent water changes and maintain excellent filtration. Ensure tank mates are not infected

Molting Complications

Symptoms

Inability to shed exoskeleton completely, stuck in old shell, lethargy after molting

Treatment

Maintain stable water parameters (pH 6.5-8.0) and provide iodine supplementation through varied diet. Ensure adequate calcium availability through cuttlebone or mineral supplements