SEASONAL FLUCTUATION IN PRIMARY PRODUCTION IN RELATION TO THE PHYSICOCHEMICAL PARAMETRS OF TWO WEED-INFESTED PONDS OF KALYANI, WEST BENGAL
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Authors
-
Abhijit Paul
College of Fisheries (Central Agricultural University), Lembucherra,
Agartala- 799 210, India
-
Bipul Kumar Das
Faculty of Fishery Science, West Bengal University of Animal and Fishe1y
Sciences, Mohanpur- 741 252, India
-
Rupam Sharma
College of Fisheries (Central Agricultural University), Lembucherra,
Agartala- 799 210, India
Abstract
Kalyani lake (P 1), a weed infested recreational water body and a weed
chocked derelict water body (P 2) in the heart of Kalyani city of West Bengal
were studied for a period of one year for their primary productivity and other
physicochemical parameters. Very low primary productivity (GPP = 360 -
1237 mg C m-2 d~1 ; NPP = 157-787 mg C m-2 d-1
) was recorded in P2 in spite of
having a high concentration of nutrients (P04-P= 0.052-0.260 mg f 1
; N03-N =
0.110-0.412 mg r1
). On the other hand, moderate primary productivity (GPP
= 1687-3195 mg C m-2 d-1
; NPP= 900-2700 mg C m-2 d-1
) was found in P1 with
comparatively low range of nutrients (P04-P = 0.010- 0.058 mg r1
; N03-N =
0.032 - 0.118 mg r1
). Mter studying the other physicochemical parameters
(temperature, transparency, dissolved oxygen, free carbon dioxide, pH,
alkalinity and macrophytic biomass), it was found that the overall
hydrobiological conditions of the weed-chocked derelict water body (P2) is not
congenial for biological production as compared to Kalyani lake (P1). Kalyani
lake may be used for fish culture with proper management practices.
Keywords: Physicochemcial parameters, primary productivity, water
body, Kalyani lake, West Bengal
