the scientific name of longevity fish is Tilapia nilotica ♂× t mossambica ♀, the common names are Nanyang crucian carp, African calf and tilapia, the English names are Nile mouthbreeder and Tilapia, and the Japanese names are ティラピァチ. This fish belongs to Cichlidae, which belongs to Tilapia. It is the offspring of the Pearl River Fisheries Research Institute in July, 1978, with Nile tilapia introduced from Thailand as the male parent and Mozambican tilapia as the female parent. Longevity fish is similar to Nile tilapia in shape and is grayish green. The suitable growth temperature is 2-35℃, which is mainly suitable for breeding in southern China. Feeding habits are the same as parents, and the requirements for feed quality are not high. (With a small amount of concentrated feed and a large amount of roughage, it can meet the requirements, and it can also eat scraps from the bottom of the pond and the water. It is the "cleaner" of the pond with strong digestive function and obvious hybridization advantages. It grows faster than tilapia, but slower than Oreochromis aureus, and has been less cultivated at present).

Wu Guoyu, an improved variety of Fushou fish, has a body length of 57 cm, generally 15-3 cm, and its breeding period is from March to November.

The general market price of longevity fish is 5 to 8 yuan per catty.