Experiences using the constraint technique on bottom trawl doors
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The constraint technique, i.e. using a rope between the warps, has the intention of minimizing the variability in trawl geometry with depth. Experiments with the constraint technique on two different bottom trawls used in the Norwegian surveys are reported and discussed. In addition, modifications of trawling technique, which enable the trawl doors to maintain constant ground contact under different conditions, are presented.