Author(s): Akinwole A.Olusegun, Dauda A. Babatunde and Oredein T. Ayokunle

Abstract: The use of simple aeration columns is mainly aimed at solving the problem of low dissolved oxygen in freshwater culture systems at a very little cost. This study investigated the performance of three simple aerating devices in aquaculture systems. The three aeration columns tested in the experiment were upturned shower rose (USR), downturned shower rose (DSR) and perforated pipe (PEP). Each of them was fitted to the base of a 36.5 cm by 26.5 cm transparent plastic water tank. Water samples were collected and run through the aeration devices between the hours of (7:30 – 8:00 a.m.), (1:30 – 2:30 p.m.) and (7:30 – 8:00 p.m.), all the experiments were carried out in triplicates. The performance of the columns was estimated using Oxygen transfer efficiency (OTE) and Oxygen transfer rate (OTR). The highest mean daily average OTE (105.32±46.10%), was recorded in DSR followed by PEP (91.03±49.35%), while the least (72.18±40.41%) was recorded in USR. The highest mean daily average OTR (27140.26±4427.57 Kg/hr) was recorded in DSR, followed by (23277.45±4176.06 Kg/hr) in USR while the least daily average (20370.28±4425.56 Kg/hr) was recorded in PEP. All the experimented aeration columns are good for fish culture systems as they are all more than fifty percent efficient, however DSR performed best among the experimented simple aeration devices.

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