There are no ponds at Maymont for fishing. The pond in the Japanese Garden is inhabited with Koi, Japanese carp, that are part of our animal family. There are ponds for fishing in Byrd Park which is adjacent to Maymont.
I wouldn't call it a Japanese park. It is on the James River do you might be able to throw a line in there. I'm not sure about ponds.
Thanks! Your answer is awaiting moderation.