On my water conditioner it says not to be used on fish raised for human consumption, and on most meds we use the same message appears. Most medication used on animals bred for human consumption is extensively tested and there for more expensive than the ones available for the pet trade. Meat, fish imported in to the UK have to pass the same welfare and quality standards as domestic livestock, I would imagine the USA is the same, asda/Walmart in the UK can tell you where each fish came from and what medication it has had, even what temperature it has been kept at while being transported.
i would think that the meds , chemicals and products we use would be more expensive then those used in commercial fish farming . if only for the reason that the pet trade stuff would be used in much smaller packages and such .
also , i would put forward that much of the stuff we use could be the same as used in aquaculture . aside from certain things that might be overtly toxic . it may well be other reasons for the labeling such as perhaps less stringent steps in production practicing protocols in the manufacturing of said chemicals and licencing .depending on the end use of product . an example would be , two places produce the same thing , one has been licensed to produce it for use in aquaculture food production because of safe producing practices , one produces it for a different sector say the pet trade . and so possibly doesnt have to adhere to certain practices during production that insure quality control although there essentially the same thing .
another example would be meds like Erythromycin or Tetracycline both meds can be used on humans as well as fish and the meds can even be purchased from the local fish store although if purschased from the fish store both will most defiantly say not for human consumption
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