With respect to hypervitaminosis A, my opinion is that this shouldn't be a problem if you are feeding mice as part of a well-balanced diet (as Cookie Monster says, a "sometimes food"). Ironically, I specifically include mice in the diet of my Woodhouse's toads because they tend to develop hypovitaminosis A ("short-tongue syndrome"/squamous epithelium). I don't think it is reasonable to feed a diet purely of mice. My thesis is simply that over-feeding/obesity are the real cuprits behind corneal opacities and other health issues often attributed to the feeding of mice. Frogs overfed insects develop these issues too.
With respect to feeder fish, as I mentioned in another thread, in one study, chytrid was detected in hatchery ponds (which are often frequented by amphibians) and the recommendation was to consider the fish (and water, etc.) as contaminated and therefore potential carriers of chytrid. My personal guess is that hatchery ponds in areas where chytrid is present are very likely to be contaminated. Fisheries don't test for chytrid because it doesn't affect fish. I would be cautious...
As a side issue, from my reading, it is likely that fish stocking (along with the concomitant transfer of contaminated water, fish and microbes) is a highly significant issue in the spread of chytrid... Will take this up in another thread...





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