Evaluation of Biofloc Technology for Astacus leptodactylus: Effect of Different Stocking Densities on Production Performance and Physiological Responses

The use of biofloc technology (BFT) in narrow-clawed crayfish (Astacus leptodactylus) culture for 45 days was evaluated by production performance and physiological status crayfish. Four different stocking densities were tested BFT (20, 41.66, 62.5, 83.33 individuals m-2). Water quality parameters monitored to sustain desired levels management. growth did not show any significant differences among the groups. However, survival rate changed density. Hemolymph indices represented total hemocyte counts relative abundance hyalinocyte, semi-granulocyte, granulocyte affected densities. Overall hemolymph glucose lactate reflected mild stress response conditions. protein concentrations change ratio BFT. normal range, indicating healthy individuals. hepatopancreas histology observed as a typical morphology all Notwithstanding relatively lower higher density crayfish, results present research revealed that adaptation conditions is promising culture.