Summary
The occurrence of Chromobacterium violaceum was investigated in the surface waters of rivers, lakes and streams of the Central Amazon Region. The bodies of waters proposed by Sioli (1965). Chromobacterium violaceum was observed in 45 (67,16%) of the total 67 samples being in 15 (75.00%) of the 20 Clearwater samples, 21 (65.6%) of the 32 black water samples and 9 (60,00%) of the 15 with water samples.