I've heard guys say that the negative pheromones that the fish release during the fight can negatively impact the catching ability of the fish, but that doesn't make scents (Sorry, couldn't help it).
You here guys saying all the time how they can mimicking scared or fleeing pray with cranks, topwaters, swimbaits, etc. and football jigs are used to represent a craw rearing up into a defensive posture... Wouldn't the prey release negative pheromones also? And I have never really noticed a difference in the ability to catch fish after two or three fish. In fact, a lot of hardbaits seem to get better with time... Just some things to think on.