There has been a test run many times by college students to test this, very popular field study test for fisheries mgt students.
Fish are caught at the mouth of a river, have balloons attached by tags and are kept in a pen till there are sufficient numbers to test.
Testers are placed upstream a significant distance from the catch area.
When the tester sees the balloons coming near them they put either dog, bear or human scent in the water.
In the tests I've seen the result for, dog scent would make the fish turn and run a good 100 yards downstream, bear would repel them a good 200 to 300 yards and human would send them down stream at least a quarter mile.
Yes everyone has varying amounts of L-Serine that we secrete so keep it clean and smoke cigars to keep the smell off your hands....... Oh yeah keep your lures clean too. PS urine had an even more pronounced effect on the fish.
PPS: I know a lot of you have your own opinion but this is fact not opinion. If you don't believe me you can look up the studies, there have been many published. Have fun.