I swear when I was killing them in the early 90's that was opening day and then April 1 here. I even recall Sam R opening on April 1. I wore em out down there when it started opening on March 20th.
Yes it used to open here on March 20th and the bag limit was 6.
I remember when it was 6. We had a “friend” down the road who would kill a limit by about lunchish on the 20th.
Limit changed to 5 well before the opening date was moved to the 15th.