Table 1. Water ‘colour’, sampling locations and sample size of Centromochlus existimatus collected in the Amazon Basin.
| River | Site | Latitude | Longitude | N | °C | pH | cm | O.D | O2% |
| Black water | |||||||||
| Negro | N1 | 3° 4'44.00"S | 60°14'44.00"W | 10 | 29.7 | 5.2 | 76.0 | 6.4 | 82.3 |
| White water | |||||||||
| Madeira | M1 | 3°28'14.00"S | 58°52'5.00"W | 15 | 29.7 | 7.1 | 5.5 | 5.7 | 82.4 |
| Amazon | A1 | 3°20'40.00"S | 60° 7'10.00"W | 3 | 28.8 | 7.2 | 12.3 | 6.7 | 86.3 |
| Amazon | A2 | 3° 6'56.00"S | 59°32'19.00"W | 15 | 29.6 | 7.1 | 18.8 | 6.3 | 85.2 |
| Amazon | A3 | 3° 4'39.00"S | 58°13'13.00"W | 2 | 28.7 | 7.1 | 18.3 | 4.8 | 84.0 |
| Amazon | A4 | 2°33'7.00"S | 57° 1'59.00"W | 17 | 29.2 | 7.2 | 10.5 | 6.4 | 85.6 |
| Amazon | A5 | 2°10'21.00"S | 54°58'21.00"W | 20 | 29.0 | 7.2 | 12.5 | 6.3 | 82.0 |
| Amazon | A6 | 2°28'10.00"S | 54°30'5.00"W | 20 | 29.7 | 7.2 | 15 | 6.6 | 87.9 |
Average hydrochemical variables are also provided (Temperature, °C; pH; turbidity, cm; dissolved oxygen (mg/L); oxygen saturation O2 (%)).