Noble crayfish
 
 
 
 
 
 

Noble crayfish

Astacus astacus (L. 1758)

Synonyms: Cancer astacus, Astacus fluviatilis, Potamobius fluviatilis

Common names: Noble crayfish (English), Edelkrebs (German), écrevisse à pieds rouges (French)

Superior taxa: `Astacidae´ < Astacoidea < Astacida < Decapoda

The Noble crayfish is the largest crayfish species native to Central Europe and was once widely distributed and abundant in low- and mid-elevation streams and lakes with moderate temperatures. During the last 140 years, Noble crayfish have largely disappeared from their natural prime habitats because of crayfish plague, water pollution and spread of alien crayfish. Isolated lentic habitats, in particular artificial habitats, such as gravel pit lakes, constitute now important refuges for Noble crayfish in Central Europe. 

 

A_astacus_distr_Chucholl.jpg

Distribution map: dots indicate confirmed presence in 50x50 km CGRS grid cells and the red area shows the probable natural distribution range. Principal data source: Souty-Grosset et al. (2006) and Kozak et al. (2013), and citations therein. 

IUCN conservation status: Vulnerable

Prime habitat: low- to mid-elevation streams and lakes with summer temperatures above 15 °C

Size (total body length): 15 cm, rarely up to 20 cm

Age at maturity: 2 to 5 years, depending on water temperatures and sex (males may mature earlier than females)

Longevity: approx. 10 years

Fecundity: up to approx. 250 pleopodal eggs

Identification

Key identification characters: First pleopod very prominent in males, in females smaller than the subsequent pleopods. Males without any hooks on the ischia of the pereiopods. Females without annulus ventralis. No prominent spine on the inner margin of the carpus of the chela (a row of smaller spines may be present). Two pairs of postorbital ridges. Cervical spines present. Rostrum flat, rostral cresta media prominent with denticulation (formed by visible spines). Rostral borders parallel or trapezoid. Chela compact, surface granulation big and rough. Inner margin of the fixed side of the chela (propodus) with an indentation limited by two tubercles.

Edelkrebs_Rostrum_pink.jpg

Head view of a Noble crayfish. Key characters are highlighted in color.

Coloration: Dorsal coloration usually dark brown, but highly variable from blue-grey to greenish, reddish, and almost black. Rarely pure blue. Small red spot on the dorsal side of the chela joint. Ventral sides of the chelae and pereiopods reddish. Juveniles with dark spots on the carapace and orange chelae tips.      

Noble crayfish_dorsal_Chucholl.jpg

Noble crayfish_ventral_Chucholl.jpg

Main references and further reading

  • Füreder, L., (Ed.) (2009). Flusskrebse: Biologie, Ökologie, Gefährdung. Veröffentlichungen des Naturmuseums Südtirol 6, Folio Verlag, Bozen, Wien, 144 p. ISBN: 9783852564067 (in German)
  • Souty-Grosset, C., Holdich, D.M., Noel, P.Y., Reynolds, J.D., Haffner, P. (Eds.) (2006). Atlas of Crayfish in Europe, Museum national d`Histoire naturelle, Paris, 187 p. ISBN: 2856535798


 
 
 
 
 
 
European-crayfish.org