I'm with Cecil on this one...

For example, my parents have a small ornamental pond, maybe 2500 gallons, with a smaller 100 gallon pool at the top of a waterfall. Well for 10 years there has been only Goldfish and Koi in the lower pond, nothing in the upper pool. Then last year about 5 or 6 small fish appeared in the upper pool, and they were neither Goldfish nor Koi. There are really only two creatures that I see as potential carriers... the Great Blue that harasses the goldfish, or one of the leopard or bull frogs that sometimes makes its home there.

Owner/Builder of Ottawa Canada's first official off-grid home.

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