It is another object of the present invention to provide a mixed treatment body and a mixing treatment method capable of reducing the pressure loss and improving the refinement efficiency of the dispersed phase and also capable of reducing the power consumption of the pump, A liquid mixer, a gas-liquid mixture processing apparatus, a fish and shellfish culture system, and a fish and shell culture method capable of increasing the flow rate (efficiency). A plurality of other fluids F to be mixed are disposed in a fluid flow path R having a narrow flow path Rs and a part of the fluid F flows through the narrow flow path Rs At the same time, they are mixed.
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