Note
A vertical profiler for measuring stimulated bioluminescence is described. Unique features include statistically rigorous sampling, facilitated by high pumping rates (up to 441 s−1), hydrodynamically calibrated excitation at the entrance to the large volume (11 1) detection chamber, and the capability of rapid vertical deployment to depths of 500 m at descent velocities up to 50 m min−1, while collecting data at 64 kilobaud. Radiometric, hydrodynamic and biological calibrations of this High Intake. Defined Excitation Bathyphotometer (HIDEX-BP) are described. Data collected during Biowatt 1987 with the HIDEX-BP are presented.