[Influence of cymothoidae (Crustacea, Isopoda, Flabellifera) on some hematological constants of the host-fishes (author's transl)].

Some hematological constants (number of erythrocytes--hemaglobin rate--hematocrit--mean blood corpuscule volume--mean corpuscular hemoglobin concentration--mean corpuscular hemoglobin) are studied in non-parasitized and parasitized Teleost fishes (parasites are Cymothoid Isopods). The parasitized fishes show an anaemia, resulting from a decreasing number of erythrocytes in circulation. The spleen undergoes a hypertrophy and a hypervascularization.