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Fish culture is a cheap source of animal protein for many households in Nigeria and water quality is a crucial factor in fisheries. The abundance of phytoplankton and physico-chemical parameters of two fishponds in the Department of Biological Sciences, Ahmadu Bello University, Zaria, Nigeria was studied fortnightly from the month of May to July 2011. The range value (means ± S.E) for physico-chemical characteristics observed are; Water temperature in pond A ranged from 25 0 C to 30.8 0 C (28.06 ± 1.96 O C), pond B ranged from 25 O C to 32.2 O C (28.78 ± 1.71 O C). Electrical conductivity in pond A ranged from 0-22 us/cm (118.50 ± 97.72) and pond B 0 to 169 us cm -1 (80.20 ± ± ± ± 73.67). Total Dissolved solids, pond A

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A Comparative Study on Physico-Chemical Characteristics and Phytoplankton Abundance between a Concrete and an Earthen Fish Pond in A.B.U., Zaria, Nigeria