The guardians of the écluse du Temple say, there are three subterranean rivers in Paris and they have heard of a subterranian lake under the Opera Garnier and think that it is possible that these underground water systems have connections and that the species of fish could be the same, wherever you go. I don't understand the names of the fish they say I am likely to find. If i can choose between three underground rivers and an underground lake, I choose the lake. I do not recall when it was, that I decided to find albino carps, but I am sure inviting the japanese emperor came to my mind approximatly at the same time.