Ammonia, which is highly toxic to fish because it interferes with their uptake of oxygen, is formed from wastes excreted by the fish, uneaten food, and decaying plants.Beneficial bacteria oxidize the ammonia to nitrate, which is not highly toxic to fish in low to moderate levels.Complete and balance the reaction in basic solution.
$ \mathrm{NH}_{4}^{+}(a q)+\mathrm{O}_{2}(a q) \rightarrow \mathrm{NO}_{3}^{-}(a q) $

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The Answer of Ammonia, which is highly toxic to fish because it interferes with their uptake of oxygen, is formed from wastes excreted by the fish, uneaten food, and decaying plants.Beneficial bacteria oxidize the ammonia to nitrate, which is not highly toxic to fish in low to moderate levels.Complete and balance the reaction in basic solution.
$ \mathrm{NH}_{4}^{+}(a q)+\mathrm{O}_{2}(a q) \rightarrow \mathrm{NO}_{3}^{-}(a q) $

Ammonia, Which Is Highly Toxic to Fish Because It Interferes NH4+(aq)+O2(aq)→NO3−(aq) \mathrm{NH}_{4}^{+}(a q)+\mathrm{O}_{2}(a q) \rightarrow \mathrm{NO}_{3}^{-}(a q) NH4+​(aq)+O2​(aq)→NO3−​(aq)

Ammonia, Which Is Highly Toxic to Fish Because It Interferes $\mathrm{NH}_{4}^{+}(a q)+\mathrm{O}_{2}(a q) \rightarrow \mathrm{NO}_{3}^{-}(a q)$