It depends on your fishery goals for the amount of BG/LMB to stock. Threadfin will do OK if you have a decent phytoplankton bloom, BUT if you get ice they will most likely croak. They will do OK in bigger bodies of water (BOW) because they have deeper, warmer water to hide in for a while, plus the more water volume the slower it is to change temps.
RE' adding fish from another BOW. You have to watch out for bringing in invasive species that you may not want in your pond. You can bring baby zebra mussels to the pond - you can't see the fertilized eggs (called veligers. - they are microscopic). You can also bring white or yellow grubs to the pond too. If you really need to bring fish from another BOW then you really should do a salt dip 3 times and do not transfer any water from the original BOW to your pond. You can bring in unwanted plants/algae too like Stony Starwort, Eurasian Water Milfoil, etc.
What are your fishery goals, large BG or large LMB?
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