Noble crayfish
Astacus astacus
Also known asBroad-fingered crayfish · Flodkräfta (Swedish) · Écrevisse à pattes rouges (French)
Water parameters
Minimum tank: 200 L per individual at harvest size.
Feed and growth
- Feed protein
- 30% target
- Daily feed (warm)
- 1.20% of body weight
- Daily feed (cool)
- 0.40% of body weight
- Max density
- 8 g per litre
A 120 g adult eats about 1.4 g of feed per day at optimum. 10 fish at adult size: ~14 g daily.
Legality
Rules vary by jurisdiction and change over time. Verify with your local fisheries or wildlife authority before stocking.
| Jurisdiction | Status | Notes |
|---|---|---|
| eu-general | check local regulations | Protected under EU Habitats Directive Annex V; harvest from wild populations regulated by member states. Aquaculture is legal and encouraged in most European countries as a conservation-compatible food source verified 2026-05-14 |
| se | permit required | Swedish crayfish fishing requires license; first Monday of August season opener is a cultural institution verified 2026-05-14 |
Unlisted jurisdictions default to "check local regulations".
Origin and habitat
Native to freshwater rivers, lakes, and streams across Central and Northern Europe, from France east to Russia and from Scandinavia south to the Balkans. The species (Astacus astacus) is the traditional crayfish of European cuisine, particularly in Scandinavia where the late-summer crayfish party (kräftskiva in Sweden) is a major cultural event. Noble crayfish have suffered catastrophic population declines since the late 19th century due to crayfish plague (Aphanomyces astaci), a water mold disease introduced with North American signal crayfish. The species is now rare or extinct in much of its former range and is listed as Vulnerable by the IUCN. Adults reach 15–18 cm and 80–150 g. The flesh is sweet, firm, and considered the premium freshwater crayfish product in Europe.
Climate and outdoor ponds
- Climate
- temperate (handles seasonal swings)
- USDA zones
- 4–7 (winter low around -34°C or warmer)
- Heating needed
- no
- Cooling needed
- no
Care notes
A high-value but slow-growing and disease-vulnerable freshwater crayfish for European aquaponics. Optimal temperature is 16–22°C, with tolerance from 2–25°C. Growth is slow: 80–150 g in 3-4 years to market size, making noble crayfish the slowest-growing commonly cultured crayfish species. FCR on crayfish pellet (30-38% protein) is approximately 2.5-4.0. The devastating susceptibility to crayfish plague means that biosecurity is critical: any contact with water or equipment from systems containing North American crayfish species (signal crayfish, red swamp crayfish) can introduce the disease and kill the entire stock. Plague-free water sources and strict quarantine protocols are non-negotiable. Stocking density is low: 3-8 crayfish per square meter of bottom area. They need shelter (stones, pipe sections, plant material) to reduce aggression and provide protection during molting. Fingerlings are available from conservation-oriented hatcheries in Scandinavia, Germany, Austria, and other countries with restocking programs. Noble crayfish culture is as much a conservation effort as a food production enterprise. The market value ($30-80/kg in Scandinavian markets) reflects both the premium quality and the scarcity. Not practical outside Europe.