Abstract
Nine fish pond were dug all were stock with two thousand Tapia species. Six triplicate ponds Trapa natans seed were plant along the bank in difference concentration .5kg, 10kg and 20kg three ponds were free from Trapa natans to serve as control experiment Trapa natans The dissolve oxygen (D.O), Biological Oxygen was recorded for the period of year. The monthly variation of dissolve 0xygen (D.O) and various concentration follow the pattern with concentration Trapa natans seedling also the fish mortality follow the pattern with concentration of Trapa natans.
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