How To Adjust The Fish Length For Correct Calculations; How To Monitor The Current Biomass - Simrad ES70 - REFERENCE MANUAL REV A Reference Manual

Simrad ES70
c Make the necessary adjustments.
Click to save the current settings and close the dialog.
d
OK

How to adjust the fish length for correct calculations

The ES70 measures and records the target strength (TS). The researchers at the
Norwegian Institute for Fishery Research have compiled a set of algorithms based on
extensive testing with the various species, and these are used by the ES70 to calculate the
length of the fish based on its target strength. However, the target strength differs between
the various species. If you find out that the length of the fish you have caught differs
from the initial presentation, you can adjust the algorithms used to calculate the length.
1 Click the icon under the
Setup
Click
2
Fish Select
→ Fish Select on page 139
Make the necessary adjustments.
3
4 Click to save the current settings and close the dialog.
OK
Note
Pay special attention to mackerel, as this fish has a very low target strength. Mackerel
can often be mistaken for small bait. If you fish for mackerel, we recommend that you
use 120 kHz or 200 kHz echo sounder frequencies, as the mackerel shows largest echo
strength for these frequencies.

How to monitor the current biomass

The biomass is presented using the
the biomass line in the echogram presentation.
→ Biomass line on page 49
→ Biomass information pane on page 51
Information pane
Click the
1
Size Distribution
2 To change the size of the information pane, click in the bottom right corner, hold
the mouse button depressed, and drag.
Click on the histogram titles to see the relevant presentations.
3
78
menu to open the
Main
to open the
Fish Select
Size Distribution
icon on the
Setup
dialog.
information pane, and/or enabling
to open the information bar.
Title Bar
sub-menu.
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