The article describes impeller aerator, soft and hard pellet mills, hydraulic pond-digging machine,water purifier etc. utilized in prawn pond clear, feed processing, aeration, water purification etc., on which mutiple-point tests were conducted with satisfactory results. In addition, it presents successful practice of live-fish container in the transportation of live-fish and juvenile prawn, as well as the effect of “artificial alga"" on water purification.
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