Furuno MODEL CSH-73 manual Fish Schools, Surface Fish School, Bottom Fish School

Fish Schools

A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of the fishes and the size of the mass how they are distributed. In the following figures, the same fish school is observed with two different tilt angles. From the left figure, the operator can know the horizontal distribution of the fish school, and from the right figure the vertical distribution.

Width (Horizontal distribution) Thickness (Vertical distribution)

Depth

Distance

Tilt:	20˚	Tilt:	90˚
Sector Center: 0˚		Sector Center: 300˚
Range:	400m	Range:	400m

Surface Fish School

Seabed

Sea surface reflections

Tilt: 5˚

Bottom Fish School

Tilt: 40˚

Seabed

Fish School

Sea surface reflections

Figure 9-2 Fish schools

9-2