Not furry either, still lovely.
Mexican Dwarf Orange Crayfish
Cambarellus patzcuarensis
Also called CPO, CPO crayfish, Mexican dwarf crayfish, Orange dwarf crayfish, Mini Mexican lobster
From Michoacán, Mexico: Lake Pátzcuaro (about 2,035 m above sea level) and nearby springs. The orange form is an aquarium colour line that is rarely seen in the wild.1
A friendly guide, not veterinary advice. For anything about your pet's health, ask your vet.
At a glance the quick version
Total length including claws.
Looks how to spot one
Exoskeleton
A pocket-sized crayfish shaped like a tiny lobster, with small claws and a segmented tail. The aquarium form is bright orange with darker orange markings; wild animals are brownish, sometimes with grey or blue hints.12
Personality what they are like
Mostly peaceful and much less destructive than big crayfish. It likes to explore plants and decor, and a group can be a little bolder, showing off with small claw displays.2
Daily activity how busy a day looks
Active forager that wanders the bottom and climbs plants; give it plenty of cover and things to explore.2
Grooming and care the hands-on bits
Keep water clean and well filtered, and offer hiding spots for moulting, when it is soft and vulnerable. Leave the shed shell for it to eat, as it recycles minerals that way. Use a secure lid.2
Home where they are happiest
Fishkeeping World suggests at least 19 litres (5 US gallons), better 38 litres (10 US gallons) for more than one. Cooler water around 16-24 °C, pH 6-8 and KH 6-12. Planted tank with caves and hiding places.2
Food basics what goes in the bowl
An omnivorous scavenger. Offer sinking pellets and algae wafers, blanched vegetables such as peas, cucumber or courgette, and occasional frozen foods like bloodworms or brine shrimp.2
Company who they like around
Can be kept in small groups if there are enough hiding spots. Good with small, quick fish that use the upper water, such as tetras, guppies and rasboras. Avoid large or aggressive fish, and be careful with dwarf shrimp and small snails.2
The story where it all began
The species was described in 1943 by Villalobos and takes its name from Lake Pátzcuaro in central Mexico. The bright orange form is a colour mutation that is seldom found in nature but became a favourite in the aquarium trade.1
Fun facts for the dinner table
- 1
It is named after Lake Pátzcuaro, a high-altitude lake more than 2,000 m above sea level.1
- 2
The bright orange colour is a mutation kept going in aquariums; wild ones are mostly brown.1
- 3
Mothers carry their eggs under the tail, and the young hatch as tiny crayfish after about 3-4 weeks.2
- 4
Young ones moult very often while growing, and they eat their old shells to recycle minerals.2
Recognised by the official bits
- Taxonomy (via Wikipedia)
- Cambarellus patzcuarensis Villalobos, 1943, family Cambaridae. The orange aquarium form is known as var. 'Orange'.1
- IUCN Red List (via Wikipedia)
- The wild species is listed as Endangered.1
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Mexican Dwarf Orange Crayfish. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amountsevery day
- Temperature checkevery day
- Water changeSmall, gentle water changesevery week
- Water testevery week
- Filter rinseRinse in old tank water, never tap waterevery month
Owner questions the things everyone asks
How often should I feed my Mexican Dwarf Orange Crayfish?
Feed your crayfish small amounts daily, as Furry Diary's starting plan suggests. Offer only what it can finish in a few minutes to avoid dirtying the water.2 Furry Diary plan
What does a Mexican Dwarf Orange Crayfish eat, and what should it never eat?
It is an omnivorous scavenger that enjoys sinking pellets, algae wafers, blanched vegetables like peas or courgette, and occasional frozen foods such as bloodworms. Never feed it anything with copper or strong preservatives, and avoid large, uneaten pieces that can rot.2
How much space does a Mexican Dwarf Orange Crayfish need?
A single crayfish needs at least 19 litres (5 US gallons), but 38 litres (10 US gallons) is better for a small group. Provide plenty of plants, caves, and hiding spots.2
What temperature, light or water does a Mexican Dwarf Orange Crayfish need?
Keep the water cool, between 16-24 °C, with a pH of 6-8 and KH 6-12. Normal aquarium lighting is fine, and a secure lid is essential to prevent escapes.2
How often should I clean a Mexican Dwarf Orange Crayfish's home?
Furry Diary's plan suggests small, gentle water changes weekly, along with weekly water testing. Rinse the filter monthly in old tank water, never tap water. Furry Diary plan
Can a Mexican Dwarf Orange Crayfish live with others?
Yes, it can live in small groups with enough hiding spots, and with small, quick fish like tetras or guppies. Avoid large or aggressive fish, and be cautious with dwarf shrimp and small snails.2
How long does a Mexican Dwarf Orange Crayfish live?
With good care, it typically lives 2 to 3 years. A clean, stable environment helps it reach its full lifespan.2
Can I handle a Mexican Dwarf Orange Crayfish?
It is best not to handle it, as it is delicate, especially when moulting. Use a net or container for moving it, and always provide hiding spots for its safety.2
Written from the sources on this page, a few checked guides (VCA, ASPCA, RSPCA) and Furry Diary's own starting care plan. A friendly guide, not a vet's advice.
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Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.
- Cambarellus patzcuarensis - Wikipedia en.wikipedia.orgused for origin, taxonomy, size, colour, IUCN status, history
- Mexican Dwarf Crayfish care guide - Fishkeeping World fishkeepingworld.comused for care, water parameters, lifespan, diet, tankmates, breeding
- VCA Animal Hospitals: Feeding times and frequency for your dog vcahospitals.comused for owner questions
- ASPCA: Dog grooming tips aspca.orgused for owner questions
- ASPCA: Cat grooming tips aspca.orgused for owner questions
- ASPCA: People foods to avoid feeding your pets aspca.orgused for owner questions
- RSPCA: What to feed your rabbit rspca.org.ukused for owner questions
Checked 2026-09-30. Text is written in our own words from these sources.