Abstract
Investigations were conducted in the laboratory on the accuracy of a commercial sonar system in detecting underwater targets. Accurate spatial resolution of fish is necessary for reliable estimates of biomass and for classifying fish species. Results suggested that the sounder was limited in target separation below 25 cm at a transmitted pulse of 0.1 ms. Modifications to equipment resulted in an improved resolution (to approximately 10 cm) of targets in both vertical and horizontal tank experiments. Target strength estimates were also determined. The application of hydroacoustics to detect and classify fish is discussed. [Work supported by Ontario Hydro.]
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