In my baitfish cocktail pond my customer informed me a he caught a 4" catfish but did not know what kind it was. My heart just sank. That is the last thing I wanted. There is almost no way to get rid of them once you get them in. They will make the water turbid sifting through mud, hog up the food supply, outbreed everything and anything. I don;t care how they taste, and we used to eat them out of the Sacramento River every week, they suck in a pond. Literally, they suck all of the resources out. They can even make a pond crash and survive it. Pretty soon you have a boatload of little ones only. Too small to eat, and hard as hell to get off the hook. I had to take one off of my boys hook and it was so small it was hard to grip and it spined me in the palm. I could barely turn the crank on my reel the next day. I could go on a true Mel Gibson rant aobut bullheads. Oh, I already did.
