Fish have a specialized sense organ called the lateral line which works much like radar and helps them navigate in dark or murky water.  

The Greatest Fishing Stories Ever Told: Twenty-Eight Unforgettable Fishing Tales

June 23, 2014 | Categories: Fishing Tips,Fun Stuff,Resources

The Greatest Fishing Stories Ever Told: Twenty-Eight Unforgettable Fishing Tales Paperback

by Lamar Underwood (Editor)
This is a great read for any fisherman!