Mugil so-iug Basilewsky belongs to euryhaline fish. The artificialpropagation of M. Cephalus and M. soiuy in seawater and brackish water has beenmade usually at home and abroad. But the artificial breeding of freshwater rearedM. soiuy remains unsolved despite that its researches have taken years. This paperreports the results achieved in the freshwater reared M. soiuy made between 1982-1986. Fingerling of 1/3 decimeter in length captured in open seas were reared inconfined freshwater piscinas with salinity of 0.297-0.569‰. "Sterility" of M. soiuyin freshwater was subdued through extrinsic pharmacological treatment of overfour years old adult fish. Sex maturity of female fishes could be successfullyreached without "seawater transition. Obstacles with regards to ovulation mecha-nism and adaptation of ovules to surroundings were overcome in the process ofartificial induced spawning. A large number of fertilized ova were obtained.6,570.000 fries were hatched and 398,000 fingerlings of over 2.5 cm in lengthwere raised. In the experiments a total number of 221 females were induced within5 years. The maturity of parent fishes reached 85%, while general birth rate was89.5% with 106 groups given induced spawning. By high density hatching, hatch-ing rate was 81%. The artificial breeding of freshwater cultured M. soiuy has beensuccessfully realized. Physiological-ecological contrast experiments as well as deter-minations of GTH content in M. soiuy blood serum by means of RIA were repea-tedly made. Encephalic hypophysis cells were proved by observing oval microstruc-ture with electron microscope. In addition, the blood brain barrier (BBB) has beenobserved existing in M. soiuy through the experiments.