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...

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Bibliographic Details
Main Authors: Engås, Arill, Soldal, Aud Vold, Øvredal, Jan Tore
Format: Report
Language:English
Published: ICES 1991
Subjects:
fish behaviour
fiskeatferd
bottom trawl
bunntrål
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485
VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924
Norway
Gadus morhua
Northern Norway
Online Access:http://hdl.handle.net/11250/104860
Description
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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