Figure 11. The cage setup used to study behaviour of cultured Calanus finmarchicus and wild caught copepods. Upper picture: The inside view of the cage (40x40x40 cm), showing the position of the two GoPro cameras and light source (a diving torch) hanging from the ceiling. The torch was used to make the plankton active – as plankton are known to swim towards the light (phototactic). Lower picture: The outside view of the cage, with the designer, Saskia Kühn adding plankton to the cage, before. The cage was covered with a thin sheet of black plastic to shoot out the light (make it dark inside the cage) enhancing the effect of the torch. Picture by Karen de Jong.
