Cecil, if raising a world record LMB hasn't been achieved yet, there must be some other limiting factor. That limiting factor might be the size of the area the fish are being raised in. When some plants (bonsai) and fish (aquariums) are confined to small areas, they don't grow very large. Might this be happening with LMB? What do you think?
On another subject, I send all of my Science News magazines to Steve Barlow who is an outstanding young biologist at Lower Suwannee NWR in Florida. However, if you wish, I could send you the New Scientist magazines once a month. Let me know if you want them.