IMO, as long as you get healthy looking fish, disease and parasites shouldn't be a problem with your pond. You may accidentally introduce a disease or parasite, but as long as it doesn't cause a huge die off or other populations problem, future generations of fish will only be stronger from surviving it. Some may disagree and I claim no expert status, but that's my point of view. CJ will have a better opinion because he has done some work with adding wild-caught fish to ponds.
