The N.I.O. combination net (RMT 1 + 8) and further developments of rectangular midwater trawls

Abstract
An opening and closing net system is described in which 1 m2 and 8 m2 rectangular trawls are combined in the same framework; details of the acoustic telemetering and release equipment are included. A brief account of the application of the rectangular system to larger and to more specialized trawls is given.

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