Toilets and Fishes

I took this picture at my local airport. They have a good sense of decorations, but why there must be fishes (aquariums)?

Perhaps they want to tell the guests to use water wisely even at the restrooms, since we share a bit of clean water with so many living things, include those fishes. But well, it was refreshing seeing those fishes here.

But honestly, its kind nostalgic, a lot of people use rivers and so as natural restrooms, only you won’t find fish inside box of glass there.

Btw, did I right wrote “fishes” as plural form of “fish”?