First season eel gonad samples were observation, which GSI was 1.59 ± 0.4%, during the breeding species of eel without feeding desire. Sampling the second quarter of the gonads anguillarum species were observed, which GSI is 0.96 ± 0.1%, the gonads still development of the primary and the secondary oocyte. To solve the problem of feeding eel, eel pond placed 30 groupers fingerlings and lead the eels feeding, after one week part of eel started to feed. The eel to various points raised deep water pools. After the depth of the pool of different eel breeding period, the third sample found GSI optimum depth of 4 meters (GSI was 1.77 ± 0.01%), followed by 1.5 meter depth (GSI was 1.41 ± 0.00%), and finally 0.5 m water depth (GSI was 1.29 ± 0.00%).
Eels sripening: Part eels sent Lukang ripening trials. Eels weekly were intraperitoneal injection, and in the injection ripening process the eels were no longer to eat, about 10 days the eels linear average weight began to decline, and pectoral fins gradually darken.