Abstract
The paper describes a vertical multiple opening and closing plankton sampler (ORI-VMPS)
having four nets, lmx lm in mouth opening and 510cm in length with accessories designed for
sampling macrozooplankton. The ORI-VMPS is opened and closed at a desired depth by com
mand relayed through a conducting cable. Depth of ORI-VMPS is monitored on a recorder. The
towing from 2,000m depth requires about 90 minutes. Therefore, it is possible to collect more
than ten time-series samples from the deep sea in a single day.
