Yes. Most strong bases (pH above 9) can kill a fish.
it can kill some fish or all of your fish if not treated right away
Since the pH is low, the acidity would be high. The acid would kill the fish not long after it is placed in the lake.
high PH's are associated with colors like blue so maybe i had a fish tank once and had to do PH tests in the water so my fish didnt die
Goldfish can. my goldfish are in a very high PH for 6months.
If the pH level is to high or low, it can kill the animals in the river.
pH can be too high, but 8.7 is not too bad for most fishes and corals. You should try and determine the source of the high pH and neutralize it if possible (unless your particular animals are adapted to higher pH).
not sure how much but mountain dew has a high enough level to kill most plants
the best pH for African cichlids is anywhere from 7.5 to 8.5 they like a high blue colour if you have a pH tester.
yeah, creating a high pH environment (pH>13), caustic kills almost all bacteria.
6, 7 will make their head pop
No. Soil behaves differently from water and requires totally different chemicals. It is never wise to start messing with pH. If your tap water pH is between 6.5 and 7.5 my advice is to leave it alone because it is very easy to kill fish with pH shock.
Well pH has an affect on goldfish health: too low or too high a pH causes the fish to be stressed and if it is stressed it is more susceptable to disease and will not grow.