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A new quantitative plankton net

Published online by Cambridge University Press:  11 May 2009

R. I. Currie  and
P. Foxton
R. I. Currie
Affiliation:
National Institute of Oceanography, Wormley, Surrey
P. Foxton
Affiliation:
National Institute of Oceanography, Wormley, Surrey
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Extract

The apparatus described in this paper was constructed for the purpose of sampling the zooplankton standing crop in the ocean in a quantitative manner.

A meter is described, which will record both the depth and amount of water which a net filters as it is hauled vertically through the water. The meter records on a smoked glass cylinder.

The meter is mounted in a brass drum which is positioned in front of the silk filtering section of the net. In front of the meter a long canvas sleeve carries the throttling rope which closes the net by the Nansen method.

Calibration of the meter for depth is done by using reversing thermometers and lowering to a series of suitable depths. Flow calibration is easily accomplished in the field by towing the canvas sleeve and meter without the silk net.

The method of smoking the glass cylinders and taking photographic records of them is described.

From the records it is possible to study the complete behaviour of the net below water—what depth range it has fished, how much clogging occurred, the depth of closure, etc

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 36 , Issue 1 , February 1957 , pp. 17 - 32
Copyright
Copyright © Marine Biological Association of the United Kingdom 1957

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References

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