Three things could have happened – an air embolus (a bubble of air trapping the movement of water so the fish suffocates), intoxication (the alcohol being toxic) or the acid in the alcohol burning the skin. Either way this doesn’t sound very nice – either for your fish or for your friend.
Oh dear! Well fish breathe oxygen that they take from the water via their gills. But fish are also very sensitive to temperature and pH. pH is a measure of how acidic or alkali something is. Beer is acidic so I guess the water got too acidic an the fish couldn’t survive!
the alcohol would probably be too dilute to kill the fish (unless she poured in 10 beers), but something else in the beer might not be good for it. Or the fish might have been old and died anyway. we can’t tell from just one test if beer kills goldfish.
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