CNBG/BG are more predatory than you think. I think it'd help the YOY CNBG population if there were FHM in there too. It'd take some predatory pressure off of the YOY. But, if you were to seine, then to help it go quicker, you'd have to use a seine with larger openings.
It all depends on what size CNBG you intend to remove from that pond to use as stockers.
Any cover in the pond will pose a seining problem, even submerged vegetation or FA.
