Garcia, FabianaMoraes, Flávio Ruas de [UNESP]2014-05-202014-05-202009-01-01Acta Scientiarum Biological Sciences. , v. 31, n. 1, p. 17-21, 2009.1679-9283http://hdl.handle.net/11449/42699The purpose of this study was to evaluate the hematological response and clinical sign of Piaractus mesopotamicus infected by Aeromonas hydrophila. Were used 324 pacus, P. mesopotamicus weighing 102.84 [plus or minus] 27.1 g distributed in 27 water tanks with 300 L of capacity, 14 fish per tank. The fish were kept in the water tanks during one month, receiving appropriate diet. In this period was avoided stressing management. After this period, the fish were infected with 6 X 108 cfu of A. hydrophila fish-1, injected intraperitoneally. The blood collection was carried 24th before experimental infection and 2411 after its. The A. hydrophila infection in P. mesopotamicus is characterized by dark skin and clinical signs related to hemorrhage, hypochromic normocytic anemia, decrease on plasmatic proteins and globulins levels, leucopenia, lymphopenia, thrombocytopenia, eosinophilia, neutrophilia and monocytosis.17-21porArtigo10.4025/actascibiolsci.v31i1.308ZOOREC:ZOOR14512074783Acesso abertoZOORECZOOR14512074783.pdf