- A device for grouping into batches at least semi-buoyant objects belonging to the group of fruit and vegetables, comprising: - a plurality of channels, called accumulation channels, allowing said objects to be grouped into batches, - a hydraulic supply device adapted to form, in each accumulation channel, a flow of a hydraulic stream able to transport the objects along the accumulation channel, - an object supply device for supplying objects to an upstream portion of each accumulation channel, - a hydraulic channel, called collecting channel, downstream of and in communication with each accumulation channel so as to be able to receive the hydraulic stream and the objects discharged by the accumulation channel, - in which device each accumulation channel is provided, at a downstream end thereof, with a holding/releasing device for holding/releasing the objects contained therein, this holding/releasing device being transparent with respect to the hydraulic stream flowing in the accumulation channel and allowing, in a closed position, the objects to be held in the accumulation channel while allowing the hydraulic stream to pass therethrough and, in the open position, allowing them to be released under the effect of the hydraulic stream to transfer them into the collecting channel, - each accumulation channel has, at least in a downstream portion thereof, called superposition zone, a height greater than the maximum vertical size of each object so as to be able to receive superposed objects, and characterized in that each accumulation channel comprises at least one bypass passage for the hydraulic stream: - extending from at least one inlet of the bypass passage located upstream of the holding/releasing device and upstream of the superposition zone, to at least one outlet of the bypass passage opening out downstream of the holding/releasing device, - suitable for diverting some of the flow of the hydraulic stream formed by the hydraulic supply device. - a plurality of channels, called accumulation channels, allowing said objects to be grouped into batches, - a hydraulic supply device adapted to form, in each accumulation channel, a flow of a hydraulic stream able to transport the objects along the accumulation channel, - an object supply device for supplying objects to an upstream portion of each accumulation channel, - a hydraulic channel, called collecting channel, downstream of and in communication with each accumulation channel so as to be able to receive the hydraulic stream and the objects discharged by the accumulation channel, - in which device each accumulation channel is provided, at a downstream end thereof, with a holding/releasing device for holding/releasing the objects contained therein, this holding/releasing device being transparent with respect to the hydraulic stream flowing in the accumulation channel and allowing, in a closed position, the objects to be held in the accumulation channel while allowing the hydraulic stream to pass therethrough and, in the open position, allowing them to be released under the effect of the hydraulic stream to transfer them into the collecting channel, - each accumulation channel has, at least in a downstream portion thereof, called superposition zone, a height greater than the maximum vertical size of each object so as to be able to receive superposed objects, and characterized in that each accumulation channel comprises at least one bypass passage for the hydraulic stream: - extending from at least one inlet of the bypass passage located upstream of the holding/releasing device and upstream of the superposition zone, to at least one outlet of the bypass passage opening out downstream of the holding/releasing device, - suitable for diverting some of the flow of the hydraulic stream formed by the hydraulic supply device.