Research and analysis

The use of a hydroacoustic counter for assessing salmon stocks

The report assesses the performance of a hydroacoustic counter, used to enumerate the passage of adult salmon in a river


The Use of a Hydroacoustic Counter for Assessing Salmon Stocks

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email Please tell us what format you need. It will help us if you say what assistive technology you use.


The results of the study show that Atlantic salmon present an acoustic target large enough to be detected above background.noise levels typical of potential sites on many UK rivers. Fish targets were detected and enumerated as they passed through the beam over a range of environmental conditions.

Published 1 January 1998