ABSTRACT. Fifty six spec imens of the hybrid "tambacu" (Piaraclus mesopotamicus Holmberg, 1887male x Colossoma macropomum Cuvier, 1818 female) were collected from fishfarm ofGllariba, Sao Paulo, to evaluate their haematology. Fishes presented 400.0 to 3, I 00.0 g total weight and 20.0 to 52.0 Clll total length. Haemoglobin, haematocrit, mean corpuscular haemoglobi n content (MCHC) and percentage of defense blood cells including leucocytes and thrombocytes, were stud ied. Statistical ana lysis showed positi ve correlation (P
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