Supplemental stocking of trout at sizes of 10"-12" should be safe from predation of your Canada LMbass. Does your hatchery have rainbow trout? I think you will have a lot more overall success using rainbows rather than browns. If the trout do not reach the soft elongated pellets first the bass should quickly learn to eat them. Let us know how the soft elongated pellets work this spring for training the bass. These soft pellets can even be shaped into elongated big worm shapes which may work even better training the bass than oval pellets especially if you also at the same time mix in some 1/2 to 1/3 long pieces of nightcrawler.