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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 1 | PAGES 135-144 | 1998
© Oxford University Press

research-article

The U-Tow: a system for sampling mesozooplankton over extended spatial scales

Graeme C. Hays1, Antony W. Walne2 and Charles P. Quartley3

1School of Biological Sciences, University of Wales Swansea Singleton Park, Swansea SA2 8PP, UK 2The Sir Alister Hardy Foundation for Ocean Science, The Laboratory Citadel Hill, Plymouth PL1 2PB, UK 3Valeport Limited, Townstal Industrial Estate Dartmouth, Devon TQ6 9LX, UK

Received on January 1, 1997; accepted on September 12, 1997 A new system is described for sampling mesozooplankton over extended spatial scales. This system, called the U-Tow, is small ({small tilde}1 m long), can be towed at high speed (>10 knots) and collects mesozooplankton in up to 50 discrete samples on a roll of filtering mesh. The spatial resolution of samples is dictated by the advance interval of the filtering mesh, which, in turn, is software controlled. So, for example, if each sample provides an integrated catch over 20 km, a single deployment may cover up to 1000 km. The U-Tow can carry a range of sensor packages with data being stored either in an internal data logger or transferred in real time up a conducting cable to be logged on the towing ship. Additionally, the U-Tow has the capability to undulate and hence sample at a range of depths. Initial results from deployments in the NE Atlantic and Irish Sea are described.


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