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PREFERRED TERM
SDN:B07::NDT003Single net or net pair vertical sub-surface tow  
DEFINITION
  • A closing mechanism or both an opening and closing mechanism are present and used to sample a single depth interval from a stationary platform. With a single messenger, the net is deployed to a particular depth, hauled to a shallower depth and a messenger is sent down to close the net. A double messenger system avoids contamination on the way down by lowering the net closed, a messenger is dropped to open it and the net is hauled to a second depth and another messenger is sent to close it. Examples of gears that can be deployed that way include opening closing nets equipped with messenger, pressure or timer release (Wiebe and Benfield 2003, Plates 6 and 8).
ENTRY TERMS
  • Sub-surface vertical tow
NOTE
  • accepted
IDENTIFIER
  • SDN:B07::NDT003
DATE
  • 2014-10-14 12:14:45.0
IDENTIFIER
  • SDN:B07::NDT003
VERSION
  • 1
IN OTHER LANGUAGES
Sub-surface vertical tow
URI
http://vocab.nerc.ac.uk/collection/B07/current/NDT003/
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