Orange Mexican Dwarf Crayfish (Cambarellus patzcuarensis var. orange)

Orange Mexican Dwarf Crayfish (Cambarellus patzcuarensis var. orange), also known as the CPO crayfish, is a vibrant, peaceful, and hardy freshwater invertebrate ideal for nano and community aquariums. 

Species Overview

• Scientific Name: Cambarellus patzcuarensis var. orange
• Common Names: Orange Dwarf Crayfish, Mexican Mini-Lobster, CPO Crayfish
• Size: 1.5–2 inches (3.8–5 cm)
• Lifespan: 2–3 years
• Temperament: Peaceful but mildly territorial, especially males 

Tank Setup

• Minimum Tank Size: 10 gallons for 1–2 crayfish
• Substrate: Fine sand or basalt (preferred for growth and comfort) 
• Decor: Caves, driftwood, leaf litter, live plants (they don’t destroy plants like larger crayfish)
• Filtration: Gentle flow; sponge filters are ideal for breeding tanks
• Lighting: Moderate to low
• Lid: Required—they are escape artists 

Water Parameters

• Temperature: 65–75°F (18–24°C)
• pH: 6.5–8.0 (ideal: 7.5–8.0)
• GH: 3–18
• KH: 3–15
• TDS: 100–500 ppm
• Nitrate: <20 ppm
• Note: Avoid copper in food, meds, or fertilizers—it’s toxic to inverts 

Diet

• Type: Omnivorous scavenger
• Staples:
  • Invertebrate pellets
  • Algae wafers
  • Blanched vegetables (zucchini, spinach, carrots)
  • Frozen/live foods: bloodworms, brine shrimp, mosquito larvae
• Behavior: Will eat leftovers, detritus, and even molted exoskeletons 

Breeding

• Ease: Easy in stable conditions
• Process:
  • Males pin females to mate
  • Females carry fertilized eggs under swimmerets for 3–4 weeks
  • Fry are born as miniature adults and are independent
• Tips:
  • Provide multiple hiding spots for fry
  • Avoid overcrowding to reduce aggression
  • Fry may eat each other if food is scarce 

Tankmates

• Compatible With:
  • Peaceful fish (e.g., guppies, rasboras)
  • Shrimp and snails (with caution—may eat slow or dead ones)
• Avoid:
  • Aggressive or large fish
  • Overcrowding with other crayfish