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D. H. Cushing, The present state of acoustic survey, ICES Journal of Marine Science, Volume 38, Issue 1, April 1978, Pages 28–32, https://doi.org/10.1093/icesjms/38.1.28
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Abstract
A distinction is drawn between methods for counting single fish and estimating biomass. Biases in both systems are indicated, and the most important of these is the capacity of the biomass method to record signals from animals smaller than desired. The best system would count individual fishes and record integrated signals from shoals and in this way the biases in either system are minimized.
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