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Physiological factors causing natural variations in acoustic target strength of fish
The swimbladder is recognized as responsible for a major part of the acoustic backscattering from fish. In most fishes it has the function of a buoyancy regulator but in others its main function isExpand
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Effects of seismic shooting on local abundance and catch rates of cod ((Gadus morhua) and haddock )(Melanogrammus aeglefinus)
To determine whether seismic exploration affected abundance or catch rates of cod (Gadus morhua) and haddock (Melanogrammus aeglefinus), acoustic mapping and fishing trials with trawls and longlinesExpand
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Acoustic sampling and signal processing near the seabed: the deadzone revisited
There are particular difficulties in making acoustic estimates of the abundance of demersal and semi-demersal fish. One possibility which exists in any survey situation is that the fish may move fromExpand
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An operational system for processing and visualizing multi-frequency acoustic data
Calibrated and digitized data from two or more discrete echosounder frequencies can be combined for the purpose of separating and extracting the acoustic scattering from zooplankton and fish in mixedExpand
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Tilt angle distribution and swimming speed of overwintering Norwegian spring spawning herring
When plankton production in the feeding areas decreases in the fall, adult Norwegian spring-spawning herring migrate into two fjords in northern Norway. In these wintering areas the herring occupyExpand
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Modelling the acoustic effect of swimbladder compression in herring
Summary Analytical expressions describing the fish-backscatteringcross-section, averaged over various geometrical and bio-acoustic parameters, have been obtained. Employing thesesolutions, theExpand
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Acoustic mapping of pelagic fish distribution and abundance in relation to a seismic shooting area off the Norwegian west coast
Abstract In April 1999 seismic investigations started in an area off western Norway as part of an ordinary three-dimensional survey, using a vessel with two seismic sources, each of 20 air guns andExpand
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Proposals for the collection of multifrequency acoustic data
We detail the requirements deemed necessary to collect multifrequency data in an appropriate manner. Expand
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Acoustic backscattering by Atlantic mackerel as being representative of fish that lack a swimbladder. Backscattering by individual fish
Developing acoustic methods for the identification of fish remains a long-term objective of fisheries acoustics. The accuracy of abundance estimation may be increased when the acoustic-scatteringExpand
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Synthetic echograms generated from the relative frequency response
Korneliussen, R. J., and Ona, E. 2003. Synthetic echograms generated from the relativefrequency response. – ICES Journal of Marine Science, 60:636–640.Calibrated, digitized data from multi-frequencyExpand
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