I have been fortunate enough to fish a variety of places, for many species of sport fish. Most of the places I have fished, have gotten tougher, but fortunately a few have improved.
In Alaska, King salmon have steadily gone down hill for many years now and no where near the spectacular fishing I had 35 years ago, when I went there to experience the wilderness. I was lucky enough to fish the best rivers, during a time of record high runs for Kings, and I don't think those runs will be like that again in my life time. Silver salmon have improved in some places, and declined in others, but in general the populations and a persons ability to catch them has stayed the same. Sockeye salmon have had a significant increase in the past few years, which in turn has improved fishing for trout, and other freshwater species, as well as provided a living for many people in a thriving commercial fishing industry. Halibut are in decline, both in general population, as well as the ability for sport fisherman to catch them. The decline and improvement of many species in Alaska is complex, and many factors, including increased sportfishing are responsible.
Big Game fishing off the west coast of Mexico, while still incredible is drastically worse than when I first started fishing there 18 years ago. Again many contributing factors, and unfortunately no foreseeable answers to the problem.
I have not bass fished in Mexico long enough to provide an accurate assessment of weather or not the fishing is better or worse. My old favorite lake is not anywhere near as good as it was three years ago for DD. bass. The reason for the decline is partially my fault for not being good at keeping a secret. The bass may still be there, but if they are they have advanced from a first grade education level to a college degree in a few short years, and again like Alaska King fishing, I feel very fortunate to have been in right place at the right time. My new favorite lake is on fire, and once again I am having a hard time keeping my mouth shut. I guess I have always been a slow learner.
The bright spot in my life as a fisherman has been the great improvement of the fisheries in Eastern WA where I grew up. The few lakes and rivers around my home town have improved 100 percent from when I was a kid. Because of heavy agricultural run off two of the rivers near my child hood home, didn't have anything but suckers, and carp when I was young. Now they both have great small mouth bass fishing, as well as rainbow and brown trout. A couple of the lakes that had some bass, are now incredible bass fisheries, as well as good trout fisheries. Fishing pressure is about the same as it was 45 years ago, so needless to say someday I want to move back. The reason for the increased number of fish is better farming practices partially credited to the federal CRP program. This combined with a decrease in population translating to less fisherman, has made right now the good old days of fishing and hunting in this small part of WA.
After reading the comments here, I have to come to the conclusion, that in general fishing is still good, but on the decline in most parts of the US, with more angling pressure being one of the biggest contributing factors. I am grateful to have experienced fantastic fishing, at peak times in numerous fisheries. I also am grateful that I am able to fish in a place now where I can explore virtually untouched bass fishing. Most of all I appreciate the fact that there a few places that are actually have much better fishing than they did 50 years ago. The fact that some places are much better than they once were gives me hope that many more fisheries will not only thrive but actually become better in time.
Even if fishing does get tougher, I have and will still fish. The challenge is what makes me pick up a rod every chance I get. If one year catching 20 bass is an incredible day, and a few years later catching five bass gives me bragging rights, I will still be out there working as hard as ever to catch the most and biggest bass in the lake, and I will still be looking for that magic lure, that will make it look easy.