Vertical distribution of zooplankton and myctophid fish at canadian weather station P, with description of a new multiple net trawl

A new multiple net trawl, designed after the opening-closing Tucker trawl, was developed for sampling zooplankton or small mesopelagic fish. The trawl carries five separate nets and is monitored and controlled electronically. In August, 1973, the trawl was used to determine the vertical distribution of myctophid fish and zooplankton occurring in the upper 440 m at Canadian weather station P in the subarctic North Pacific Ocean.