1. Fisheries College, Jimei University, Xiamen, Fujian Province, China
2. Engineering Research Center of the Modern Technology for Eel Industry, Ministry of Education, Xiamen, P.R. China
3. Fujian Provincial Key Laboratory of Marine Fishery Resources and Eco-environment, Xiamen, Fujian Province, China
4. SiChuan Agricultural University, Ya'an, Sichuan Province, China