Too cold to get Silver Perch fingerlings through winter then ... IMO... and even if you did, they wouldn't grow... and wouldn't be ready until next March anyway.... at the earliest...
Trout is by far your best option in the circumstances.... with the option of obtaining advanced Silver Perch fingerlings around Oct, early Nov... which would allow you to then carry them through next winter...
Of course by then... you'll have a nother tank or bigger system... and can still do another batch of trout as well....
