The present invention is a culture system for a bait organism or plankton and a suspension water changer. The suspension water exchanger comprises a positioning frame capable of suspending a water surface and a drum having a transverse shaft disposed on the positioning frame, the drum comprising a bottom portion. A circular tubular filter that enters the water and has a pump inside the filter. When the water is changed, the motor drives the drum to rotate and the water inside the drum is pumped out by pumping, and the rotation of the drum causes a shear force between the outer edge of the screen and the water body, thereby preventing the bait organism from being adsorbed on the filter net and remaining self-cleaning. It also reduces the damage to the bait organisms by changing the water, and achieves the effect of increasing the density of the culture； in addition, the suspension type water changer has the characteristics of easy installation and use, convenient replacement of the filter screen, and low cost, so that the overall breeding system is more valuable for industrial use.本創作為一種餌料生物或浮游生物的養殖系統及懸浮式換水器，該懸浮式換水器包含一能夠懸浮水面的定位架以及一橫向軸設於該定位架上的滾筒，該滾筒包含一底部沒入水中的圓管狀濾網，且濾網內設有一泵浦。進行換水時，馬達驅動滾筒旋轉並且藉由泵浦將滾筒內部的水體抽出，該滾筒的旋轉會使濾網外緣與水體之間產生剪力，避免餌料生物吸附於濾網上而保持自淨，並減少換水對餌料生物的傷害，達到提高養殖密度的功效；此外，懸浮式換水器具有容易安裝使用、方便更換濾網、以及低成本的特色，使整體養殖系統更具備產業利用價值。
