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Fish school density
If two fish scools appear with the same color at different depths, the one in deeper water is
denser because the ultrasonic wave attenuates as it propagates and the fish school in deep
water tends to be displayed in a weaker color.
Fish Echo
Less Reddish
(Sparse echo)
Reddish
(Dense echo)
Difference in
signal strength
Weak Echo
Strong
Echo
Fish school density
4.5 Other Echoes
Plankton
A plamkton layer, a likely place to find fish, is displayed in green or blue dots. It usually descends
in the day and rises at night.
Fish School
Plankton
Plankton
Current rip
When two ocean currents meet with different speeds, directions and water temperatures, a
current rip develops. A current rip’s on-screen appearance is as shown below.
Current Rip
Current rip