| The food chain
It is possible that there could be a link to the food chain so to speak with koi. They are in outdoor ponds. It is unlikely that the ponds could overflow into native water but it is possible with big rains, floods, pump outs etc the fry are small and could possible escape taking something with them. It could also be possible for wildlife to carry one of the pathogens to another source not likely but possible. The native and or commercial fisheries can be a big lobby
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