Controllable net-free fish box

The invention discloses a controllable net-free fish box, and relates to aquaculture. The controllable net-free fish box is provided with a base, a gas guide tube, a tubular gas source, a sound velocity gradient pore plate, an underwater loudspeaker and a rod-shaped support, wherein a circle of groove is formed in the periphery of the base and is used for placing a heavy object, so that the whole body is fixed at the water bottom of a breeding site; the tubular gas source is uniformly paved in the base, and the sound velocity gradient pore plate is arranged at the top of the base; the gas guide tube is arranged on the base and is used for connecting the tubular gas source with an external gas pump so as to generate nanobubbles; the nanobubbles form a bubble curtain under the action of the sound velocity gradient pore plate to surround an culture area; the underwater loudspeaker is nested on the sound wave rod-shaped support; the rod-shaped support is nested in the groove at the bottom of the base and penetrat