careful
Did some spotting years ago. It is a tough job and the pay is all over the place. We usually lost at least one pilot every season due to inexperience, wx, badly maintained airplanes, etc... Flying low and slow over the water 50 or 80 miles out in a zig-zag pattern all day is just asking for an accellerated stall. Most of the pilots lost were newbies.
There is also much competition among the fleets. Had another spotter point a pistol at me when we both began an orbit on the same fish.
We were paid by the pound too... and there is no way for you to verify that from the air. Bottom line is, unless you're a professional fisherman and really want to do this... there are plenty of better flying jobs out there.
Good luck,