The Japanese eel is one of the most important species of the aquaculture
industry of Taiwan. Glass eels for aquaculture is completely
caught from wild. Recently, glass-eel catches not meeting the demand of
aquaculture farms. However,natural sources of glass eel have declined
rapidly in recent years. Tanaka et al. (2003) first successfully produced
glass eels in captivity, but still unable to reach commercial
production . one of the major problems of seed production is stable
production of high quality eggs. This study will be aimed to culture
feminized eels in order to get the good quality eel eggs.