How big were the CNBG you stocked in Dec. ? One thing to keep in mind is that those Dec CNBG are the base of your fish food chain. You don't want them eaten before they get to spawn over the summer. If you add LMB now that are big enough to eat them in any #s you might have a problem of LMB over crowding sooner. My suggestion , if you want to speed things up, is to buy about 1000 4-6 in CNBG and stock them now ( stock before April) and in the fall add 100 6-8 in LMB from the other ponds. That should be enough to really get things going with a good growth rate.