Please dont remove this post. Everyone here should be civil enough to express their opinion/concerns and ideas without having an arguement over it. Disipline the people who do such things not the forum as a whole. This is a very interesting thread and has probably been over thousands of times of bass forums, this is a wonderfull way to share ideas and possibly change a fishery for the better.
My Opinion: I CPR all fish I catch, except what I use for bait. That being said there is nothing wrong with people keeping fish as long as it complies with the laws. However I have seen many big fish (blue catfish especially) caught dragged back to the dock or home for a photo and then trashed. I do not agree with any kind of waste like that no matter the fish or game species.
Slot limits and regulations work. This is true world wide. Blue catfish were introduced into Va rivers in the 70' and 80's with no regulations on size or limit. In the early 2000's it got popular and serious catfish anglers lobbied the state for regulations to prevent over harvest of trophy size blue catfish. With a limit of only one blue over 32 inches per person per day, this applied to all forms of fishing comercial and recreational. Since then we have seen the state record broken nearly every year untill the latest 143 lb blue.
That being said catfish will over populate the rivers if smaller fish are not harvested. This lowers competition for food and allows the bigger fish to grow larger. I cant speak for Texas waters and the populations there, but here in Virginia the one fish over 32 inches has greatly improved out large catfish population and left large window for those who fish for food to do just that without taking excess large fish from the river. This applies mostly to trotliners and comercial harvest as they have a greater ability to catch large numbers of big catfish. If anyone is interested I also have a link to a biologist study of our rivers here that goes into detail about how the 32 inch rule effects the fishery.
Here is just a small protion of it which applies to what is being discussed.
"Mortality rates for blue catfish to age 8 are very low in these populations, however as fish reach the age (9 – 14) where rapid weight gain occurs, total annual mortality increases dramatically, approaching 60%. Given this high level of mortality, and slowing growth, continued harvest restriction on large-sized fish will continue to benefit the trophy aspect of the fishery. Conversely, dramatic increases in harvest of small fillet-size fish would be beneficial, as overcrowding is a problem – associated with slowing growth.
The full report can be viewed here and is very educational and interesting IMHO.
http://www.dgif.virginia.gov/fishing/forecasts-and-reports/tidal-river-blue-catfish-report.pdf