Modeling fish reaction to vessel noise, the significance of the reaction thresholds
Working paper

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http://hdl.handle.net/11250/100509Utgivelsesdato
2001Metadata
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Sammendrag
A simple model of fish reaction to vessel noise is made. The fish
are assumed to swim directly away from the noise source. The main
noise source is assumed to be the propeller. Parameters for endurance
and swimming speed are obtained from the literature. The initiating
stimuli in the model are the loudness and/or the change in loudness.
A sensitivity analysis is used to check the importance of the parameters.
The model is very sensitive to vessel noise and the fish reaction
thresholds. This is an artefact of the dB-scale used in the loudness
measure. However, if the fish interpret the dB-scale as almost linear,
this may also explain some of the variability in vessel avoidance problems.
A small change in the reaction thresholds, may lead to significant
changes in the resulting behaviour. If the task is to model fish reaction
to vessels, emphasis should be put on the reaction thresholds and noise
field around the vessel, rather than swimming speeds and endurance.
In general the parameters describing the physiology are less sensitive
than the parameters describing the behaviour.
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ICES CM documents2001/Q:10