Not furry either, still lovely.
Blue Crayfish
Procambarus alleni
Also called Electric blue crayfish, Florida crayfish, Everglades crayfish, Sapphire crayfish, Blue Florida crayfish
From Florida, USA: east of the St. Johns River from Levy and Marion counties south through the peninsula, plus some of the Florida Keys. It lives in still or slow-moving water and digs burrows when levels drop.12
A friendly guide, not veterinary advice. For anything about your pet's health, ask your vet.
At a glance the quick version
German Wikipedia gives 10-12 cm, with some reaching about 15 cm.
Looks how to spot one
Exoskeleton
A typical lobster-shaped crayfish with two strong claws and a fan tail. Wild animals range from tan-brown to bluish, while aquarium lines have been bred for an intense cobalt blue all over.12
Personality what they are like
Confident and busy. It climbs, digs and rearranges its tank, and may catch small fish that sleep near the bottom, so it is best treated as the star of its own tank.2
Daily activity how busy a day looks
Active, especially in warmer water. Give room to roam, climb and burrow, with several caves.2
Grooming and care the hands-on bits
Needs clean water, a gravel bottom to dig in and hiding caves for moulting. Plants may be chewed. A tight-fitting lid is wise since crayfish are good climbers.2
Home where they are happiest
German Wikipedia suggests at least a 60 cm tank for one animal and about 1 m or more for a pair, at around 20-25 °C. Gravel substrate, caves and sturdy decor.2
Food basics what goes in the bowl
Omnivorous. In nature it eats water plants, fallen leaves, carrion and small animals. In the aquarium offer crayfish pellets plus vegetables such as carrot, cucumber, peas and pepper.2
Company who they like around
Usually best kept alone or as a carefully set up pair in a large tank. Small bottom-dwelling fish may be caught.2
The story where it all began
Named by Faxon in 1884, this crayfish is native only to Florida. Wild animals are often brown, but the blue form attracted aquarists, and selective breeding produced the vivid blue line now common in the hobby.12
Fun facts for the dinner table
- 1
Its natural colour is usually brown; the famous electric blue comes from selective breeding of a naturally occurring blue form.1
- 2
When water levels drop in the wild, it survives by digging burrows.2
- 3
Females carry their eggs and young under the tail on small swimming legs; a clutch can bring 50-100 babies.2
- 4
It is often confused with a different 'blue crayfish', Cambarus monongalensis, from the Appalachian region of the USA.1
Recognised by the official bits
- Taxonomy (via Wikipedia)
- Procambarus alleni (Faxon, 1884), family Cambaridae.1
- IUCN Red List (via Wikipedia)
- Least Concern.1
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Blue 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 Blue Crayfish?
Feed your Blue Crayfish daily with small amounts. Furry Diary's starting plan suggests feeding every day. Check the food label for exact portions and ask your vet if unsure.2 Furry Diary plan
What does a Blue Crayfish eat, and what should it never eat?
Blue Crayfish are omnivores; offer crayfish pellets and vegetables like carrot, cucumber, peas and pepper. For foods to avoid, it's best to ask a vet, as the facts do not list specific unsafe items.2
How much space does a Blue Crayfish need?
A single Blue Crayfish needs at least a 60 cm tank, while a pair needs about 1 meter or more. Provide a gravel bottom, caves, and sturdy decor.2
What temperature, light or water does a Blue Crayfish need?
Keep the water temperature around 20-25°C. Perform daily temperature checks and weekly small water changes as per Furry Diary's plan. A tight-fitting lid is important. Light needs are not specified; a normal day-night cycle works.2 Furry Diary plan
How often should I clean a Blue Crayfish's home?
Clean with small, gentle water changes every week and rinse the filter monthly in old tank water. This keeps the water quality good. Furry Diary plan
Can a Blue Crayfish live with others?
Blue Crayfish are usually best kept alone or as a carefully set up pair in a large tank. They may catch small bottom-dwelling fish, so avoid tank mates that sleep near the bottom.2
How long does a Blue Crayfish live?
Lifespan varies depending on care and environment. For specific information, ask a good breeder or an exotic-pet vet.
Can I handle a Blue Crayfish?
Handling is not covered in the facts. It is generally best to avoid handling aquatic invertebrates; ask a vet for guidance.
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.
- Procambarus alleni - Wikipedia en.wikipedia.orgused for names, range, taxonomy, colour, IUCN status
- Procambarus alleni - Wikipedia (German) de.wikipedia.orgused for size, behaviour, diet, aquarium care, reproduction
- 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.