SeapiX – Operation Manual
SSD-C-1302 Ed. A – 01/2020 63
5.3.3 CLASSIFYING FISH AND USING THE CLASSES
Thanks to its Single Echo Detector SED algorithm, SeapiX extracts water column particles
and biomass targets, and displays it in 2D & 3D views. Water column back scatter tool
computes the distribution related to the 2D area & layer selection. The operator can map
and analyse the water column.
As a prerequisite, set the filters before locating the biomass:
From the Histogram box, locate the significant highest peak of biomass.
In that example, very small pelagic biomass is located close to the surface, responding
- 74 dB:
Select the mean peak by moving lower/higher threshold cursor:
Move the ‘lower limit’ cursor at Peak value minus 3dB and move the ‘higher limit’ cursor
at Peak value + 3dB.
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