Simrad ES70
Size Distribution information pane
Figure 27
Size Distribution
information pane
To open this information pane, click the
Size
Distribution
icon on the
Title Bar
.
The
Size Distribution
information pane shows a
histogram of the single fish echoes detected. The
calculation is based on the parameters you have
selected in the
Calculation Interval
dialog; time, ping
or a chosen part of the current view. It thus provides
a visual indication on how large the fishes are within
the chosen interval.
Only the fishes detected by the current transducer
frequency are shown.
The large number above the histogram shows the
average size of all the fishes in the histogram. The
value is presented in the unit you have chosen in the
Units
dialog. For an accurate x-axis value, place the
cursor on a vertical bar in the histogram, and read the value from the label.
The abbreviation TS is commonly used. It means “Target Strength”, and this is a
measure of how strong echo the individual fishes in the current echogram generate.
The echo strength indicates the size of the fishes. The
Size Distribution
information
pane thus provides a mathematical estimate of the sizes of all the chosen fish species in
the echogram.
The target strength from a fish varies from specie to specie. To change the fish species,
use the
Fish Select
dialog opened on the
Setup
menu.
Note
The
Size Distribution
information pane is only available if your ES70 is equipped with one
or more split beam transceivers.
The following information is provided in the
Size Distribution
information pane.
1
Fish species
: The current fish species, as selected in the
Fish Select
dialog, is shown.
2
Echogram
: You can see size distribution histograms from three different sources.
•
Upper Echogram
: This histogram is created based on fish echoes from the top
echogram for the chosen channel. By default, this is a surface echogram.
The data is calculated based on the selection you have made in the
Calculation
Interval
dialog.
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Summary of Contents for ES70 - DOWNLOAD AND INSTALLATION REV B
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