浜名湖是日本静水养鳗的发源地,近年来由于水质污染严重,并受台风影响,损失很大,现在已衰退到全盛时的40%。为解决水质污染而发明的流水养殖法,已在日本的九州、四国等地实现,但为维持养鳗所需的25℃温度,燃料开支很大,又需要很大的面积作养鱼池,管理等开支也很多。最近出现的在密闭箱内进行温水循环的养殖方法,可解决上述 Hamamoto Lake is the birthplace of Japan’s still water eel, which suffered heavy losses in recent years due to water pollution and is now affected by the typhoon. It has now dwindled to 40% of its peak. The aquaculture method invented to solve water pollution has been implemented in Kyushu and Shikoku in Japan. However, it requires a large fuel consumption to maintain the 25 ° C temperature required for raising eels, and requires a large area for fish ponds. Management and other expenses are also many. The recent emergence of warm water circulation in the closed box culture method can solve the above