Figure 1

Description of the AMAZE set-up. (a) The incubator housing the activity monitor set-up for precise temperature control during the experiments. (b) The structure that provides the mounting spaces for the experimental columns, programmable LED light bars, power supply, and data transfer. (c) Experimental column (height: 80 cm, diameter: 9 cm) equipped with infrared light-barrier system. (d) Custom-designed detector module, consisting of two circuit boards fitted with six pairs of IR light barriers. (e) The AMAZE set-up installed on the krill fishing vessel Antarctic Endurance. (f) Comparison of midday light spectrum in the activity monitor (black line) and in the field between 50 and 70 m water depth (colored lines).