I think the source of the fish is a key . Know their age - ask and check on the seller's reputation.

How big are your biggest predators and what type? That will determine survivability of smaller LMB stockers. If you have good #s of 20+ in. LMB they can eat 8-10 in LMB. I would suggest pre-release habituation of the LMB you are going to add if they are subject to predation.

Pre-release habituation

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=7;t=000284;p=1

http://www.pondboss.com/cgi-bin/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=8;t=000124