IMO, a quality trout fishery is one that you have a reasonable expectation of catching trout. To me, what changes with the seasons is the number of quality fisheries available. Streams with wild fish have several advantages, generally including year round "quality" status, and the very nature of wild trout being more enjoyable to fish for and catch than stocked trout. But I won't say that a stocked stream cannot be a quality fishery, it most certainly can. Here are the numbers:
Class A: around 460 streams.
Supports Nat. Reproduction: around 1500 (includes class A)
Stocked streams: 746
Stocked Lakes: 128
Now, the hard part is the interpretation. A large number of stocked streams support natural reproduction in the headwaters, perhaps even class A numbers, so those are on two lists. Sometimes these sections are close to one another or overlap. But in other cases, they can be miles apart. Take the Allegheny River, it goes from wild brookies, to mixed wild brookie/brown/stocked trout, to a large stream with pure stocked trout, to the Kinzua tailwater with fingerlings, to a mouth of tributaries fishery. Is this one stream? The Tully is similar, is the limestone stream well above the lake the same as the tailwater? For the sake of analysis, we'll consider these situations to be one stream, though its important to recognize the value of a huge fishery like these over a tiny trickle that may have a quarter mile of decent trout fishing. Also, of the non-class A wild trout streams, a large number of them are brookie streams that probably support Class A populations in certain areas or in certain years, but are more susceptible to things like drought than the class A streams. In addition, I've found a number of streams with good populations of wild trout that aren't on the fish commission list, how many are there? This analysis is also pure numbers, if you canceled streams found solely or mostly on posted property, the numbers go down considerably. The following is broken down by season, and are just my guesses/estimates:
Spring: 1000 quality wild trout streams, 750 quality stocked or mixed stocked/wild quality trout streams, 128 quality lakes.
Worst part of the summer: 800 quality wild trout streams, 150 quality stocked or wild/stocked streams.
Fall: 1000 Quality wild trout streams, 250 quality stocked or wild/stocked streams. Plus whatever fall stocking is done.
Winter: Numbers similar to fall, but regulations limit where you can fish.
Yeah, I'd say there's lots of opportunity in this state. Harvest and fishermen killed fish play a small role overall in the number of opportunities, but that effect can be major on some streams, generally the more valuable and therefore popular ones. The bigger effect of harvest and fishermen killed fish doesn't cancel a stream from the "quality" category, but makes the average fishermen catch 3 or 4 instead of 10-15 fish.