If this is to be used as a Wonder, I would think the most logical route would be something religious based.
A Torii in general is the gateway to a shinto shrine, The Floating Torii depicted here is the gateway to the Itsukushima Shrine. Incidently it is one of Japans most popular tourist attractions.
I know fish are important to Japanese people, and maybe in a Japanese food the bonus food production would work, but I have always been under the impression that Wonders were (in theory) suppose to be just indentiy-less.
Regardless, if my opinion matters, I would think something religious based (maybe promote state religion, free cathedral for state religion (or effects similar to a cathedral), maybe just a generic shrine with effects similar to the rest of them?