Recalcification time, prothrombin time (PT), partial thromboplastin time (PTT) and activated partial thromboplastin time (APTT) were determined for common carp plasma. Clotting times were 37.6±8.7 s (mean±SD) recalcification time, 23.5±3.4 s PT, 17.9±3.2 s PTT, and 5.1±0.7 s APTT, respectively. The difference between APTT and PTT suggests that the intrinsic hemostatic system is developed in carp blood. Citrated plasma lost its clotting activity within 12h during incubation at 37°C, whereas clotting activity was maintained for long hours at 25°C. The shortest clotting time was obtained for the mixture of BaSO₄ adsorbed plasma and serum. This indicates that coagulation factors of carp blood can be classified into the serum factors and barium sulphate adsorbed factors.