Abstract
A new, opening-closing, paired zooplankton sampler for horizontal or oblique towing was built and tested. Two nets, which have cylinder-cone filtering section and canvas collar, are at-tached to a frame constructed with two acrylic pipes (23.4cm I. D.). The nets are opened and closed by means of a double releaser (General Oceanics). The sampler is simple to consturct and easy to use, and furthermore it is very light (6.5kg in air). In 151 tows, the sampler fuctioned 97 percent of the time. A depth of the sampler changes scarcely even when the nets are opened. The revolution number of a flowmeter attached in the pipe is little during the nets closing. Consequently the revolution number of a flowmeter can give the correct filtered water volume.
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