Ichthyofaunal Diversity and Water Quality in the Kangsabati Reservoir, West Bengal, India

Table 1

Seasonal variation of physicochemical parameters of the water in Kangsabati Reservoir, March 2010–February 2011.

Parameters; (units)	Summer season; (March–June)	Rainy season; (July–October)	Winter season; (November–February)
Air temperature (^°C)	33.58–36.83	31.06–35.83	25.0–35.25
Water temperature (^°C)	28.16–31.50	28.80–31.66	18.33–27.83
Transparency (cm)	40.83–181.66	133.0–193.6	188.1–308.5
Conductivity (µmho/cm)	15.73–17.11	12.14–16.43	11.95–14.47
pH	7.32–7.72	7.38–7.98	7.42–8.45
D.O. (mg/L)	7.20–9.00	7.60–11.60	10.40–12.00
Alkalinity (mg/L)	54.33–94.00	40.67–79.66	60.33–80.34
Chloride (mg/L)	132.91–305.3	127.4–160.93	110.9–160.40
Phosphate (mg/L)	0.014–0.041	0.098–0.199	0.037–0.062
Total inorganic nitrogen (mg/L)	0.50–1.08	1.06–1.96	0.74–1.02
Hardness (ppm)	115.18–178.6	137.00–195.36	112.60–170.60
Salinity (ppt)	0.26–0.57	0.25–0.31	0.22–0.31
Photic depth (cm)	32.66–170.00	117.00–176.60	163.00–287.00
Free CO2 (ppm)	3.66–4.00	3.33–7.00	3.66–9.66
Water level (ft)	396.00–399.00	405.00–432.80	409.20–415.80
Rainfall (average in mm)	4.30–138.20	90.80–213.60	0.00–34.80
Plankton population
Plankton density (ind/L)	1362–2183	965–1681	1253–2240