Effects of a geophysical survey on catching success in longline fishing
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The effects on longline catches of a geophysical survey conducted during the winter fishery for cod (Gadus morhua) were studied. Spatial extent of the effects was investigated by comparing the catch rates of longlines set at various distances from the survey tracklines, and duration of the effects was studied by analysing the catch rates of longlines soaked after the sound emissions ended. Catch reduction of 55-80% was observed for longlines set within the seismic survey area. The results indicated that the acoustic device used caused a 24-h duration and 5-miles spatial extent of reduced catches.