Apparatuses for directing the displacement of aquatic crustaceans are provided and are particularly used to carry out the methods for attracting the motion of aquatic crustaceans after feeding by utilizing their biological tendency responding to a bright and dark contrast. These apparatuses generate the visual effect of bright and dark contrast at a predetermined place within the water body of culture and comprise a container for carrying the water body of culture and a predetermined place inside said container expressing an effect of bright and dark contrast. Light emitters themselves or protrusions and/or painted patterns/figures and/or filtration of light filters, under the existence of illuminating light, are used for generating visual effect of the bright and dark contrast.