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Hydrogen sulfide is a strong toxin, but 
its strong smell (rotten eggs) will alert 
you to its presence. When salt water turns
black on the bottom this indicates sulfur and 
anoxia. (The black stuff is iron sulfides). Don't
linger in sulfurous water unless you're diving a 
fullface mask.
In freshwater you wont get hydrogen sulfide -- 
you get methane, which is not toxic.
Saltwater fish farming may get hydrogen sulfide
killing fish in net cages, since it rises as a
toxic "aeration" from polluted bottom. 
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