The present invention relates to a floating carrier and a cultivation system for crops such as lettuce in floating carriers on water. The cultivation system comprises a basin comprising at least one elongate production pond with an infeed end on a short side and an opposite outfeed end and with water therein, a number of elongate floating carriers, the length of which corresponds to the width of the elongate production pond and which move in an orientation transversely of a longitudinal direction of the elongate production pond through the production pond from the infeed end to the outfeed end at a rate corresponding to bringing the crops to full growth, which floating carriers each comprise a number of growth locations for the crops where holders for the crops or roots of the crops extend into the water, and a transport system comprising a lifting mechanism and conveyors.
