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JOURNAL OF PLANKTON RESEARCH | VOLUME 9 | NUMBER 6 | PAGES 1069-1073 | 1987
© Oxford University Press

research-article

A collapsible opening-closing net for zooplankton sampling through ice

Michael C. Macaulay and Kendra L. Daly

School of Oceanography, WB-10, University of Washington Seattle, WA 98195, USA

Received on November 3, 1986; accepted on May 20, 1987 The English umbrella net is a new-design vertical closing net developed to sample zooplankton populations in under-ice environments. Operating on the principle of an umbrella, this wide-mouth net fits through a hole drilled in sea ice and expands below the ice to sample the water column. A messenger-activated release closes the net for a discrete sample and collapses the frame so that it can be retrieved back through the hole in the ice. Nets of this design were used for extensive sampling on Fletcher's Ice Island (T-3) in the Arctic Ocean.


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