A week. According to the detailed information of blue crane, blue crane is one of the most common marine fish, and its hunger tolerance is very strong. Fish's stomach can store food for 7-8 days, so it won't die if it is not fed for a week. A blue fish that is considered to be the bluest. This fish is mainly distributed in the Strait of Taiwan Province Province, including Xisha, Nansha, Philippine Sea and Indonesia.