I've been around commercial crab boats quite awhile and I have not seen any round pots on the big boats only the smaller Puget Sound crabbers. I fish the sound alot and can't remember not being able to limit on crabs when I want that many and all I've used in years are the cheap square traps by danielson, I had better quality, small commercial type round traps but they were heavier than hell and cost to much to replace when stolen, so I stick with the cheapies and have no problem cathing crabs in square style pots.