Everyone here is pretty much correct. There really are no "native" fish left save a very few on only a couple rivers (especially Columbia tribs). On the coast, I am not so sure, many fish that come in to the Hoh and Sol Duc and others may very well be native. 60years ago, when DNA was just being discovered, tons of hatchery fish were released, and basically left to do whatever they wanted in terms of spawning. In the rivers they returned to, hatchery fish interbred with wild fish, hatchery fish bred with other hatchery fish, and their offspring would all come out as wild looking fish. So if the offspring came back and spawned again, that is two generations seperated, and they basically now would be considered "wild".
The so called "rescue programs" are designed to aid fish considered "wild" in spawning, based on escapement numbers and the previous years redd count, and if the run is considered "wild". This is done by collecting "wild" fish on their way up to spawn, and bringing them to a hatchery where they are artificially spawned. Ideally the fish are raised to fry size "60-75mm", and then put in acclimation ponds on the rivers they were taken from. These fish, while bred in a hatchery have no marks on them (i.e. no elastomers, no fin clips, and because they were only in cement for a month or two they will have no fin erosion). These fish are then released from the acclimation ponds when they reach a certain size, generally 110mm. There is absolutely no way for you to tell that they were ever in a hatchery pond, or who their parents were. Furthermore, the biologists who collect the wild brood stock don't know who the brood stocks parents were, just that they have no hatchery marks on them. The gene pool is so convoluted right now that there really is no way to tell if a fish is "native" or "wild". On the bright side, WDFW is active in taking genetic samples from adults and thier offspring to try and get an overall idea of how many fish are "wild".
Supplementation programs, while many think are ther only for people to catch, have many other purposes. When you catch an elastomer marked fish for example, not only does the color of the tag mean something, but also which eye it is behind. For example, a right eye pink elastomer could be a "wild" male crossed with a "wild" female, whereas a left eye pink elastomer could be a "wild" male crossed with a hatchery female. When the fish return and are collected at a damn or weir, or caught (this is why it is important to send in your catch record cards), biologists can get an idea of the relative fitness as it is related to who bred with who. This is also being done way more in depth with spring chinook runs in the Wenatchee basin.
Anyways, in terms of fight, I have caught hatchery fish that fought like wild fish and vice versa. The fitness in general is not a measure of fight, but how likely they are to come back and produce more offspring, and how well they are able to compete for resources. Another way of putting it is that fitness is a measure of reproductive success, not how well a fish fights when hooked. At the end of the day it is up to the individual whether or not they want to release a hatchery fish or eat it. They are there for you to keep, and they are also encouraged to be kept. They taste just the same as wild fish too. If you aren't going to eat it though, or don't have anyone to give it too, put the biomass back in the river, somebody (another fish, another person, etc.) will eventually eat it, or they'll spawn because there hormones are telling them to. We are trying to fix what our previous generation did now, and are doing the best we can. We shouldn't complain about it because there is nothing we can do to change the past. It is all about the future now, and the biologists are working hard to figure out what we did in the past, learn from the mistakes, and do it better the next time around.
Tight lines
James :beer2: