Perch Fishing Secrets

[Gumbo]

Leaky, though you hear some guys say they can tell, you really can't be sure. If you mark two fish at the same depth, and one arc is larger than the other, you still can't be certain. The reason is because your sonar shows a three-dimensional world on a two dimensional display, and you have no idea what part of the cone each fish was in when the sonar marked them. And some parts of a sonar's cone return a stronger signal than others.

Sometimes a high-end sonar will display some arcs with deeper bellies, or thicker arcs. These CAN imply bigger fish, but not necessarily.

Hope this helps.