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CPO Crayfish
Cambarellus patzcuarensis
Animalia›Arthropoda›Malacostraca›Decapoda›Cambaridae
Variety of Mexican Dwarf Crayfish · orange (CPO)
📍 Mexico
The CPO (Cambarellus patzcuarensis orange) is the selectively bred orange color morph of the Mexican dwarf crayfish, displaying a vivid solid orange coloration that makes it far more visually striking than the wild-type. It retains the same small size (under 2 inches), peaceful temperament, and easy care of the base species, and is one of the most popular dwarf crayfish in the hobby.
Care Guide
Diet
CPO crayfish are omnivorous scavengers that consume algae, plant matter, and small organisms. Feed high-quality sinking pellets or specialized crayfish food 2-3 times weekly, supplemented with blanched vegetables (zucchini, spinach) and occasional frozen foods like bloodworms or brine shrimp. They will also graze on algae and decaying plant material in the tank.
Behavior
CPO crayfish are nocturnal and spend most of the day hiding among plants, rocks, and substrate. They are generally peaceful and solitary, though they may occasionally spar with tankmates over food or territory. They are active foragers and will constantly search the substrate for food, making them entertaining to observe during evening hours.
Breeding
Breeding CPO crayfish in captivity is moderately difficult but achievable with proper conditions. Females produce small clutches of 20-30 eggs and exhibit maternal care, fanning and protecting their brood. Provide plenty of hiding spaces, stable water parameters, and avoid aggressive tankmates; juveniles are vulnerable and may be eaten by fish or larger crayfish.
Tank Mates
Peaceful algae eaters that occupy different ecological niches and ignore crayfish
Small, peaceful fish that stay in mid-water and avoid crayfish territory
Larger shrimp that can coexist with CPO; may compete for food but generally compatible
Smaller shrimp may be predated upon; only suitable in heavily planted tanks with ample hiding
Peaceful snails that occupy different feeding niches and provide algae control
Hardy plant that crayfish won't uproot; provides shelter and grazing opportunities
Common Diseases
Shell Rot (Bacterial Infection)
Soft spots, discoloration, or pitting on the carapace; lethargy and loss of appetite
Improve water quality and perform regular water changes; isolate affected individual; treat with antibacterial medication if severe
Parasitic Infection
Excessive molting, visible parasites on body, lethargy, and reduced feeding
Quarantine affected crayfish; perform frequent water changes; use copper-free parasite treatments suitable for invertebrates
Molting Complications
Inability to shed exoskeleton, incomplete molts, or death shortly after molting
Ensure adequate calcium and minerals in water; maintain stable pH and temperature; provide soft substrate for easier molting
Fungal Infection
White or fuzzy growth on body or appendages; lethargy and reduced activity
Improve water quality and increase water changes; use antifungal treatments; remove decaying food and organic matter promptly
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Varieties
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Water it likes
- ph
- 6.5–8.0
- ammonia
- 0 ppm
- nitrate
- <20 ppm
- temperature
- 61–75°F (16–24°C)
Stats
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