Avoidance reactions of ultrasonic tagged cod during bottom trawling in shallow water
Introduction: Observations made by echo sounder (Ona 1988) have shown that cod (Gadus morhua L.) may avoid an approaching survey vessel horizontally and vertically. However, there has been a lack of information on the escapement behaviour of the individual fish. This short note discribes an experime...
Main Authors: | , , |
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Format: | Report |
Language: | English |
Published: |
ICES
1991
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Subjects: | |
Online Access: | http://hdl.handle.net/11250/104860 |
Summary: | Introduction: Observations made by echo sounder (Ona 1988) have shown that cod (Gadus morhua L.) may avoid an approaching survey vessel horizontally and vertically. However, there has been a lack of information on the escapement behaviour of the individual fish. This short note discribes an experiment carried out in a shallow fjord in Northern Norway, where the reactions of single cod towards a small survey vessel during bottom trawling were studied, using ultrasonic tagging technique. |
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