Sagan Z., Feliñska C., 1972. Preliminary studies on blood groups of eels Anguilla anguilla (L.). Acta Ichthyol. Piscat. 2 (1): 63-68.

Presented are the initial results of studies on appearance of blood group characteristics at European eels. No presence of iso-agglutinin was noted. It ascertained that the erythrocytes of certain eels show special agglutination, by respective human serum and lactines.