This study was supported by the National Natural Science Foundation of China(No.31201995);the Shanghai Municipal Agricultural Commission(No.20132-2);the Shanghai Municipal Science and Technology Commission of Chongming(No.13231203504);the Open Foundation of Engineering Research Centre of Modern Industrial Technology for Eels,Ministry of Education,China(No.RE201501).
The Yangtze River and its branches are important habitats for the Japanese Eel(Anguilla japonica),however,there are few data on gonadal development and silvering indices of eels during the downstream spawning migratio...