According to the Baidu game, the goldfish fruit in the game After Tomorrow can be used to make dishes or exchange rewards at the caravan market. The specific uses are as follows:

1. Cooking: When making goldfish fruit dishes, add advanced product gold! Fish fruit! Can improve the level of cooking.

2. Redeem rewards: Survivors can use goldfish fruit to redeem rewards in the caravan market.

It should be noted that if the planted but unreceived snapdragon returns its seeds due to reasons such as quitting the camp, the survivors need to replant snapdragon to get goldfish fruit.