Lake Fork is well known as a trophy size bass fishery and the slot limits are designed to keep it one, the thought is the 16 - 24 inch bass are the prime spawners? Even Ohio has slot limit lakes for bass, to encourage bigger than average size fish?
"
Black bass
For largemouth bass, length limit is a 16-24” slot. Bass 16 inches and less or 24 inches or greater in length may be retained. Only one bass 24 inches or greater may be retained each day. For smallmouth bass (if present), minimum length = 14 inches. No minimum length on spotted, Guadalupe, and Alabama bass (if present.) Daily bag limit for all species = 5 black bass in combination. "
Lake Fork rules, they apply to everyone?
Just a trim? https://www.wired2fish.com/news/angler-charged-with-fraud-in-big-bass-event-on-lake-fork/#slide_1