Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-28T19:12:50.979Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Clarke, G. L. & Bumpus, D. F., 1950. The plankton sampler—an instrument for quantitative plankton investigations. Amer. Soc. Limnol. Oceanogr., Special Publication, no. 5. 8 pp.Google Scholar
Foxton, P., 1956. The distribution of the standing crop of zooplankton in the Southern ocean. ‘Discovery’ Rep., Vol. 28, pp. 191–236.Google Scholar
Geary, P. J., 1954. Flexure Devices. Pivots. Movements. Suspensions. British Scientific Instrument Research Assoc, Res. Rep., M. 18.Google Scholar
Goldstein, S., 1950. Modern Developments in Fluid Dynamics. 2 vols. London: Oxford University Press.Google Scholar
Harvey, H. W., 1934. Measurement of phytoplankton population. J. mar. biol. Ass. U.K., Vol. 19, pp. 761–74.CrossRefGoogle Scholar
Hermann, F., 1949. A recording depth gauge for use in horizontal hauls with stramin nets and other pelagic fishing implements. Medd. Komm. Havunderseg., Kbh., Ser. Fisk., Bd. 11, No. 5.Google Scholar
Kemp, S., Hardy, A. C. & Mackintosh, N. A., 1929. Discovery Investigations: Objects, equipment and methods. ‘Discovery’ Rep., Vol. 1, pp. 141–232.Google Scholar
Künne, C. L., 1929. Vergleich der Fangfahigkeit verschiedener Modelle von planktonNetzen. Rapp. Cons. Explor. Mer, Vol. 59.Google Scholar
Nansen, F., 1915. Closing nets for vertical hauls and for horizontal towing. Publ. Circ. Cons. Explor. Mer, No. 67.CrossRefGoogle Scholar
Wiborg, K. F., 1948. Experiments with the Clarke-Bumpus plankton sampler and with a plankton pump in the Lofoten area in northern Norway. Fiskeridir. Skr. HavundersBk., Bd. 2, No. 2.Google Scholar