Effects of a geophysical survey on catching success in longline fishing

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 w...

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Bibliographic Details
Main Author: Løkkeborg, Svein
Format: Report
Language:English
Published: ICES 1991
Subjects:
long line
line
gear experiments
redskapsforsøk
acoustics
akustikk
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452
Gadus morhua
Online Access:http://hdl.handle.net/11250/104858
Description
Summary: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.

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