Abstract
Acoustic population estimates are performed routinely in fisheries. Usually, however, they have to stand on their own merit. A unique opportunity has been exploited to compare a series of acoustic surveys with a weir count that monitors the escapement of sockeye salmon, Oncorhynchus nerka, into a lake. Each survey was analysed by three acoustic methods; the results are compared among themselves and with the weir count. A detailed sensitivity analysis looks at the possible variance and bias in each method. Finally, several methods are used to estimate the acoustic fish target strength. These estimates are compared with published target strength values.
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