The use of data storage tags to study cod natural behaviour and availability to abundance surveys in the Barents Sea
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http://hdl.handle.net/11250/105775Utgivelsesdato
1997Metadata
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This report is not to be cited without prior reference to the authorsSammendrag
Vertical movements of fish stocks can be studied by means of acoustic data from surveys, and
diurnal related cycles in behaviour is often reported. To what extent the movements observed by
this method reflect behaviour of individual fish, or alternatively, reflect probabilities of fish to be
distributed at bottom or in the pelagic zone at specific time periods is unknown. Improved
knowledge of fish natural behaviour is essential to understand variation in availability and
efficiency of survey trawls as well as the actual target strength used in acoustical surveys. Data
storage tags (DST) represent a new tool to observe individual fish behaviour in relation to
environmental factors like temperature, depth and light.
In this paper the results from tags attached to North-East Arctic cod, released at spawning ground
and during feeding, are presented and analysed with emphasise on implication of fish behaviour
on efficiency of abundance surveys.