Back in the late 70’s we would fish spot using my airplane.  This is a 1967 7ECA Citabria (airbatic spelled backwards).   It would cruse at 100 mph and stay up for about 6 hours on 34 gallons of gas.  It made a nice platform for spotting fish due to the high wing and the tandem seating which allows both pilot and passenger good visibility looking out both sides.