The gear was described as "equipment comparable to that currently used in CalCOFI", but note that this is 1958 data.
For zooplankton biomass (displacement volumes), a "regular" and "closing type" net were used. Each had a mouth diameter of one meter. The main body of the net was made of 30XXX grit gauze (nominally 0.55 mm square mesh) with a rear section and cod-end of 56XXX grit gauze (nominally 0.25 mm square mesh). A flowmeter was mounted in the center of the mouth of each net.
For nekton, a "very large coarse-meshed plankton net" was hauled obliquely at 5 knots. The net was "about 20 feet long, with a 5 foot (square shape) iron frame". The mesh used was a Marion Textiles pattern 467 nylon ("5-7 meshes per inch").
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