Histological, Genotoxic, and Biochemical Effects on Cnesterodon decemmaculatus (Jenyns 1842) (Cyprinodontiformes, Poeciliidae): Early Response Bioassays to Assess the Impact of Receiving Waters

Table 1

Physicochemical parameters and water quality index (WQI) of the water sampled at the Reconquista river.

Parameters	Units	Methodology	Reconquista River water	Argentine; Guideline; (mg/L)
Temperature	°C		11.5	≤ 45
pH	UpH	Hanna field meter	7.9 ± 0.1 (3)	6.5–10
Conductivity	µS/cm	Hach field meter	720 ± 5 (3)
Turbidity	UNF		94 ± 2 (3)
Hardness	mg CaCO3/L	EDTA titration	65 ± 5 (3)
Alkalinity	mg CaCO3/L	H2SO4 titration	678.6 ± 5.8 (3)
Chlorides	mg /L	AgNO3 titration	27 ± 1 (3)
DO	mg O2/L	Iodometric	3.4 ± 0.1 (3)
Ammonium	mg N-/L	Colorimetry	0.41 ± 0,03 (3)	0.05–0.47
Nitrites	mg N-/L	Colorimetry	0.05 ± 0.01 (3)	≤ 0.06
PRS	mg P-/L	Colorimetry	0.29± 0.004 (3)
BOD5	mg O2/L	Iodometric	1.93	≤ 50
COD	mg O2/L	Colorimetry	18	≤ 250
COD/BOD5			9.33
WQI			7.33
Heavy metal	mg/L	Atomic absorption spectrophotometry
Cr			< 0.005	0.002
Pb			< 0.010	0.001
Cd			< 0.005	0.0001–0.0004
Cu			0.010	0.002–0.004
Zn			0.013	≤ 0.030
As			0.009	≤ 0.03

Surface Water Guidelines for protection of aquatic life or maximum allowable content in effluents disposed in a water body. Data are expressed as mean ± SEM of three readings.