Current World Enviroment Vol. 2(1), 35-38 (2007) Study of some limnological properties of Harchandpur pond, District Etah (U.P.) India

The present investigation deals with seasonal variations of physico – chemical parameters and Quantitative analysis of a rural pond during the year 2005 -2006 . Water temperature was maximum (33.7 0C) in May and minimum (15.2 0C) in January; Transparency was max. (35.5 cm) in Jan. and lowest (27.0 cm) in July; Alkalinity & Hardness were high in May – June and D.O. had highest value (8.20 mg/l) in Dec. and lowest(3.32 mg/l) in Aug.; Planktons (No./l) were abundant two times a year (Summer & Winter pulses) and lowest during monsoon season.

management programmes due to lack of public attention, dis-management and infiltration of excess biogenic pollution.However people awareness could regenerate good conditions for production of living biota for commercial purposes.In this pond fishing is practisized by local contractors on behalf of Village Panchayat.
The Harchandpur pond is 9 Km.away from Etah city on Etah -Kanpur G.T. Road and located at about 0.25 Km. on eastern side of G.T. Road.The covering areas is around 10 hectares.
The purpose of study is to prepare qualitative and quantitative assessment of the abiotic and biotic conditions prevailing in the pond.

MATERIAL AND METHODS
Water samples were collected in clean glass bottles once in a month throughout the year (July 2005 to June 2006).Water temperature was recorded with centigrade thermometer.

RESULTS AND DISCUSSION
Four seasons were taken into account viz.Monsoon (July to Sept.), Post monsoon (Oct.to Nov.), winter season (Dec.to Feb) and summer season (march to June).Water temperature was more in summer and less in winter due to climato-geographical factors.Season wise fluctuation was due to heat gain from solar energy and transfer by conduction.(Chauhan et. al., 2006).Transparency was noticed high during winter and post winter times in which water becomes clear and transparent increasing penetration of light (low turbidity).Lower values were found in rainy season due to incoming surface run off with turbid rain waters.
Alkalinity and Hardness were higher in summer probably by high growth of biota, more sewage, higher decomposition, domestic discharges and depletion of water level.Carbondioxide and bicarbonates concentrations got depleted in post monsoon and winter due to high rate of photosynthesis.pH kept more or less changing with alkalinity.
The D.O. concentration was suitable measure for aqua culture and fish management.D.O. was available in the pond by the direct diffusion from air and photosynthesis.(Dhakad and Chaudhary 2003).Dissolved oxygen (D.O.) was recorded maximum in winter due to high rate of photosynthesis and holding capacity of water.Its concentration was reduced during peak summer and monsoon due to more respiratory activities and decomposition by organisms.More pollution load also reduced D.O.
Phosphates and silicates had higher values in monsoon due to infiltration of agrochemicals, bony materials and other organic matter.Lower values were due to (in winter) more consumption by limnoplanktons (Mishra et al.,1998).
Phytoplanktons act as bridge between abiotic and biotic complexes in wetlands (Saha et al.,2000).Chlorophyceae, Cyanophyceae, Bacillariophyceae were found as major groups of phytoplanktons while Rotifera, Cladocera and Copepoda were abundant Zooplanktons.Optimum presence of limnoplanktons leads to healthy production of macrofauna including fishes.No single factor could govern the production of limnoplanktons.Infact variations in planktonic production attribute to many factors.Two pulses of limnoplanktons were observed during present investigation.First one was recorded in winter and second one in summer (khan et al.,1974).Higher values of pH, D.O.and transparency and low temperature, moderate values of alkalinity, phosphates and other vital minerals were probably responsible for winter pulse while Summer pulse was due to higher values of temperature, pH and alkalinity and moderate value of penetration of light.
Minimum growth of planktons was recorded during monsoon due to less D.O., minimum sunlight, less photosynthesis and transparency and load of turbid waters with organic pollution.These findings about limnoplanktons are similar to some extent to Jindal and Vasisht (1985).
The limnological evaluation of pond water described above shows certain fundamental features which promote moderate pisci-culture.Higher values of D.O., alkaline pH, higher values of total alkalinity and moderate presence of limnoplanktons are responsible for productive nature of pond.