The fish in the meaning of Chinese is having leftovers of money, an increase in prosperity remain or surplus because in Chinese, "fish" sounds like 'surplus'.
Dumplings are a classic Chinese food, and a traditional dish eaten on Chinese New Year's Eve, widely popular in China, especially in North China. Chinese dumplings can be made to look like Chinese silver ingots (which are not bars, but boat-shaped, oval, and turned up at the two ends). Legend has it that the more dumplings you eat during the New Year celebrations, the more money you can make in the New Year.
The Meaning of Chicken is prosperity, togetherness of the family.
“In North China, everyone eats the jiaozi dumplings,” says Dunlop. “Families will make a dough and wrap it around pork and cabbage, and boil [the dumplings], then serve them with vinegar and soy sauce. You can wrap them in the shape of an old silver ingot.” Gong writes that during New Year celebrations jiaozi are called yuanbao, a reference to the ancient, ingot-shaped Chinese currency, and that eating them is said to bring prosperity. While making them, families sometimes tuck added good-luck foods like peanuts (to bring long life) into some of them.