Way back in the old days they seemed to keep everything. They did not care if they were big or small, they kept them all. They got bragging rights by taking pictures of the most fish on shore with the fish hanging off hooks in front of a resorts sign.
Then it seemed like size was the most important and they kept, stuffed and put the trophy fish on a wall for bragging rights.
The former was probably relatively better than the latter for the ecosystem. It meant the year classes kept a natural balance as far as percentage of the total population. Just keeping trophies means, you have a 100% chance of taking quality genes out of the pool.
Now we have digital cameras that let us share pictures of our catch, not only online, but instantly on shore or texted to our friends no matter where they are. We have instant bragging rights without needing to kill a fish.
Seems like technology has been very good for fishing and that could insure a healthy fishery in the future. I think some bodies of water still exist that are still ecologically healing after decades of ignorance to conservation practices that will insure a healthy, balanced ecology in our fisheries.
That is if the invasives and/or the aggressive and overzealous rules to try to stop their spread do not take the fun out of fishing completely.