In situ target strength observations on haddock
Original version
This report is not to be cited without prior reference to the authorsAbstract
In situ target strength measurements of ideally resolved
haddock have been made using the ES-400 split-beam echo
sounder. The measurements are compared with the mean target
strength obtained simultaneously by counting / integration.
Within the estimated confidence limits of the observation
volume in the counting method the two estimates of mean target
strength agreed, both being about 4 dB above the currently
applied mean target strength of gadoids.