I have been fishing for 57 of my 62 years. Fishing is still the same, today as it was when I was young, there are a small minority of anglers that would drain the lake or stream to harvest all the fish, with no consideration for others or the ecosystem that they are destroying.
I have fished almost exclusively in Minnesota, where I was born and raised, and moved back to Minnesota to raise my own family. I have seen the ecosystem of our freshwater lakes, ponds, rivers, streams, creeks being destroyed by self-centered individuals and groups are only concern about catching and keeping as many fish as possible (even ignoring the fishing regulations on daily quotas + allowed number of a species in possession (freezers storage).
Their greed, and being self-centered, have destroy many a productive waters over the 57 years. It is impossible to hire enough game and fish wardens to police all of the public waters.
I know of three bodies of water that are on State Land, that still have the Giant Blue Gills of my Youth. I never take anyone with me when I visit these of a vanishing species, that on other waters have been replaced with "Runts".
I know of other waters (also on State Land) where there is also excellent fishing, that few (if any besides myself) know of.
I do not remember where I read a story about a fly angler who told a friend at work about a trout stream pool he had fished the previous weekend. His friend from work went to that pool along with all of his fishing buddies the next weekend and harvested all of the trout, leaving a empty pool, that is no longer a place to go fishing for a long time (if ever again).
"Three Can Keep A Secret, Only If Two Are Dead!" ~Parnelli