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SAMPLING METADATA

Sampling and Processing Summary
The data were sampled as part of the North Pacific (NORPAC) Survey, also described as the Marine Salmon Exploratory Fishing Surveys.

Sampling Gear:   Zooplankton were sampled with a plankton net (45 centimeter diameter, 2 meter length) equipment with a 330 micrometer nylon mesh net.

Towing Method:   Vertical tows were lowered to 150 meters and then retrieved at 1 meter/sec or faster.   Horizontal tows were towed at 2 knots for 10 minutes just below the surface.

Analysis:   Organisms longer than 1.5 inches (tunicates, meduase, siphonophores) were removed before measuring. The reported wet weight therefore represents only organism < 2 inches in length.


Sampling Gear Net Mesh Tow Method
( depth range )
# of Tow
% of all Tows
Plankton Net (Silk) 650 um oblique
under ~25 m
10 1.3 %
Plankton Net (Silk) 650 um oblique
down-to ~50 m
34 4.4 %
Plankton Net (Silk) 650 um oblique
down-to ~100 m
77 9.9 %
Plankton Net (Silk) 650 um oblique
down-to ~250 m
1 0.1 %
Ring Net 650 um horizontal
"surface"
26 3.3 %
Ring Net 650 um oblique
down-to ~100 m
30 3.8 %
Plankton Net (type not specified) 330 um horizontal
"surface"
42 5.4 %
Plankton Net (type not specified) 330 um vertical
down-to ~100 m
461 59.0 %
Plankton Net (type not specified) 330 um vertical
down-to ~250 m
19 2.4 %
Plankton Net (type not specified) 330 um vertical
down-to ~500 m
81 10.4 %
  TOTAL TOWS 781 
Sub-Collection:   North Pacific Survey COPEPOD
https://www.st.nmfs.noaa.gov/copepod
Web v14.1   [ 2017-Sep ]