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Considering the knowledge on freshwater crayfish feeding requirements and other culturedcrustaceans, a practical extruded diet was formulated with the aim to be used for juvenileastacid studies from the onset of exogenous feeding. According to a bifactorial design,the practical diet was compared with the diet which has allowed repeated good survival andgrowth results (control: feedstuff for trout combined with Artemia cysts)in groups and individually isolated crayfish in an 80-day experiment. Diets tested did notaffect final survival rates and growth neither in grouped nor in isolated crayfish, beingthe highest survival rate (average: 93%) and growth values (average: 13.2 mm carapacelength: CL, 578.1 mg weight: W, 3.52%·d-1specific growth rate: SGR, 1896.6% weight gain: WG)reached with the practical diet. Survival rates did not show significant differencesneither among crayfish maintained in groups (86% for the practical diet and 81.7% for thecontrol diet) nor among isolated crayfish (100% survival). Isolated crayfish hadsignificantly higher growth (14.3 mm CL, 760 mg W) thanthe grouped crayfish (11.5 mm CL, 354 mg W). Resultsshow the feasibility of the proposed practical diet as basis for further studies onastacid crayfish

Proposal of a practical diet for juvenile astacid crayfish studies from the onset of exogenous feeding under controlled conditions