A Free-falling Drop Net for Quantitatively Sampling a Water Column
- 1 March 1977
- journal article
- research article
- Published by Oxford University Press (OUP) in Transactions of the American Fisheries Society
- Vol. 106 (2) , 140-145
- https://doi.org/10.1577/1548-8659(1977)106<140:afdnfq>2.0.co;2
Abstract
A new drop net is described which samples a column of water from surface to bottom. The net is non-sprung and falls freely to bottom. Surface pontoons release the net as a ring covering 182 m2; the net assumes a cylinder shape closed at the top, and then strains the water column as it descends. On bottom, the net is pursed and retrieved. A parachute effect combined with vertical vectors of downward force keeps the net at full aperture. Field tests with 1.0 m and 15.2 m diameter models in depths to 28 m were made in Green Bay, Lake Michigan [Wisconsin, USA]. Details of net construction and the delivery device employed are provided.This publication has 0 references indexed in Scilit: