Figure 6.

Three-dimensional algal trajectories passing through the model copepod's capture area for basic steady translational swimming behaviours along the horizontal direction, i.e. horizontal swimming backward (u/|w_terminal|<0) and forward (u/|w_terminal|>0). Here, u is the horizontal (x-direction) swimming velocity component and w_terminal is the model copepod's terminal sinking velocity. The positive x-direction is defined as the direction from dorsal to ventral. A frame of reference fixed on the copepod's body is used.