First....landowners are not required to post 'no trespassing' signs on their property. It is upon the individual to know whether or not he is on private or public property. 'I've fished this canal for 25 years' is not research to determine if the canal is private or public.
Secondly....what is really driving landowners to prohibit people on their property is frivolous lawsuits. So, if you want to blame somebody for the state that we are currently in....blame lawyers. And, who makes up the majority of Louisiana Legislatures? Lawyers. They will protect their own as long as they are in control. So, we will likely never see any sort of tort reform in this state. And, before you spout off about the state having laws to protect landowners from recreational use liability....that is simply not the case. There are too many instances of payouts where landowners were not given the protections under LA RS 9:2791 and 9:2795....those are the revised statutes that are supposed to give 'immunity' to the landowner when Joe Public wants to cash in on 'my fault insurance.'
Lastly....If I'm a lease holder paying really good money to a landowner so that I have access to property to hunt....let's use duck hunting for an example...let's face it...most of the property in question is leased to duck hunters...is it okay for some jackleg to come running through my leased duck ponds, cruising through the eroded marsh with his surface drive....because there is water that he can traverse that was once legitimate marsh? Now, you're the lease holder....what do you do? You complain to the overseer about some jackleg fishing in your duck pond, scaring ducks off with his loud exhaust or just the simple presence of being there. If you're the lease holder and some jackleg breaks into your camp and steals stuff from you, what do you do? You complain to the overseer. The overseer's response to these and other problems is simple. If you're not a lease holder, you have no business being there.
And to those saying 'put up a gate.' You should look up the current laws restricting that action. Otherwise, I'm sure there would be a lot more gates out there.
Pre 1980's....people respected other people's property. People understood, 'I can only fish this canal. I cannot go trolling up this mudboat ditch and into that duck pond to go fishing.' Landowners and fishermen got along great. Then, I'm guessing the fishermen began to get greedy....'If I can only get back there. I bet the bass are held up and waiting on me to catch them.' Then, one person does it....so, it's okay for another person to do it...because...'he was doing it.' Pre 1980's....people were also accountable for their own ineptness. There were no frivolous lawsuits where landowners had to payout millions because some guy was riding down the canal at night, with no lights....the canal dug by the landowner....and the boat driver strikes an object....such as a pylon or well head...that the landowner owned. So, now the landowner has to pay for 'your fault insurance.'
And....the irony of it all....guess who is able to afford paying the outrageous, skyrocketing prices for leasing that land....you guessed it....attorneys!