胡瓜魚 (Osmerus dentex Steindachnner) 卵の人工孵化の二三に就て

Formalin and sea-water disinfection methods were examined for water-rnold, growing on egg of Kyuri-uo. By the use of 5% formalin for half an hour the best hatching rate was obtained. But its application should be avoided for hatching eggs and showed no effect on water-mold already grwon, as the dead water-mold body covered the egg to die. Sea-water had the same desinfecting power as formalin, showing no bad influence on eggs in the case of 4hours-immersing. A few other factors affecting the hatching and the method of treating eggs were studied and discussed.