Table 2.

Haematological parameters of Aequidens metae caught in different sites of the Ocoa River and a reference site (Negro river), Villavicencio—Meta, Colombia during dry and rainy season

Nuclear alteration	Dry			Rainy
	Site 2	Site 3	Reference	Site 2	Site 3	Reference
Erythrocytes (x106x µl-1)	2.06 ± 0.09	2.09 ± 0.10	2.38 ± 0.13	1.58 ± 0.09*	1.80 ± 0.12*	2.26 ± 0.15
Leukocytes (x103x µl-1)	71.65 ± 6.71	74.25 ± 5.95	60.11 ± 5.46	40.09 ± 1.35	56.56 ± 1.85	32.32 ± 1.62
Thrombocytes (x103x µl-1)	70.10 ± 9.04	51.24 ± 4.67	57.36 ± 6.96	33.59 ± 1.33	52.75 ± 2.23*	26.73 ± 0.88
Hemoglobin (g/dl)	7.82 ± 0.31*	7.47 ± 0.32*	10.03 ± 0.27	8.55 ± 0.18	8.15 ± 0.08	8.61 ± 0.51
PVC (%)	21.0 ± 0.68	19.26 ± 0.79*	23.63 ± 0.94	23.57 ± 0.85	21.60 ± 0.46*	26.0 ± 0.98
MCV (fL)	107.38 ± 5.33	105.90 ± 8.40	105.04 ± 8.21	153.80 ± 4.01	138.20 ± 7.0	119.73 ± 5.79
MCH (pg)	41.03 ± 2.75	41.68 ± 3.53	44.33 ± 2.93	59.18 ± 3.60*	55.09 ± 3.85*	35.56 ± 5.46
MCHC (%)	37.70 ± 1.42	40.14 ± 1.78	43.0 ± 1.34	37.91 ± 1.78*	38.63 ± 1.10*	28.30 ± 2.97
Lymphocytes (%)	63.27 ± 0.50*	56.62 ± 0.50*	75.38 ± 1.05	63.18 ± 0.53*	64.93 ± 1.57*	73.93 ± 1.08
Neutrophils (%)	29.30 ± 0.84*	32.41 ± 0.74*	23.75 ± 0.90	28.75 ± 1.05*	28.98 ± 0.96*	23.0 ± 0.95
Monocytes (%)	3.03 ± 0.28	2.51 ± 0.16	2.38 ± 0.29	3.46 ± 0.31	2.98 ± 0.16	2.79 ± 0.32
Basophils (%)	0.55 ± 0.09	0.59 ± 0.08	0.44 ± 0.13	0.57 ± 0.10	0.40 ± 0.08	0.64 ± 0.13
Eosinophils (%)	0 ± 0	0 ± 0	0.38 ± 0.13	0 ± 0	0.30 ± 0.07	0.36 ± 0.13

* For the same season of year, asterisks indicate statistically significant differences (p < 0.05) between the reference site and the monitoring sites. Site 1 (Nacimiento, before entering the city), site 2 (Centauros, where sewage from the city is dumped), site 3 (Caño Seco, after the city and close to a landfill) and reference site (R)