+Gathering affects your ability to actually reel a fish in.
This is easily tested by fishing for something high level, and then removing some gear with +Gathering until suddenly you start seeing "the fish got away".
+Perception affects your ability to catch HQ fish.
Again, this is easily tested by pulling out 100 fish, then removing some perception and puling out another 100 of the same fish to compare HQ rates.
But do these stats have any secondary effects for Fisher?
For example, I've seen mention that +Gathering affects the rate at which you catch fish. For example, if you had 200 +Gathering, you might get a bite every 15 seconds on average, but if you threw on another 50 +Gathering, you might get a bite every 12 seconds on average.
Has anyone been able to confirm or dispute this?
I know that live bait vs lures affect bite rate, but I'm finding it difficult to test the effect of +Gathering on bite rate.