Obviously, sushi is available. I mean, Japan is where sushi first appeared. A nation, just a few hundred kilometers to the east of China, with the ocean on both sides of its boundary and an abundance of fish and other water resources.
Japanese restaurants that are owned by Japanese or other nationalities sell sushi in China in big quantities. The simplest response to the query is this. We will find sushi easily there, especially in big cities like Beijing, Shanghai, Tianjin, Ningbo, Shenyang, Hong Kong, Shenzhen, Xiamen, Macau, Guangzhou, Kunming, Wuhan, Chongqing, Harbin, Chengdu, etc. Because China has a large number of Japanese restaurants and every year, the perception of Japan seems to rise and create a record high (never forget that China and Japan have fought over history.
However, if I am not mistaken, there is a blog entry on the internet that claims that the original method of producing sushi, which uses seaweed and rice, was brought to Japan from China around the year 700. The Japanese then created their own distinctive sushi and began exporting it abroad.
Even in Korea, a delicacy similar to sushi is known as kimbap. Sushi was a popular dish in Japanese-ruled Korea, and it is believed that kimbap is influenced by this cuisine.