Effect of Light on the Hatching of Fish-egg.

Abstract

In order to examine the effect of various color rays on hatching of fishegg, colorless, blue, red, orange and dark color rays were used on the hatching of eggs of Wakasagi (Uypomeius olides), Ugui (Tribo'Odonkaktieucm), Carp(Cyprinus caupis), and gold fish (C'arassMis carassius). The result of expèrirnints is shown as follows: 1.In the case of eggs of Wakasagi, there was no difference on the rate of hatching when they were exposed in orange, red and dark color rays, and other rays showed a good result on hatching. But blue color ray proved no good result and colories ray was the worst (Table 1). 2.In the experiment of eggs of Ugui, blue, orange and red color were produced good resulis. There was no difference on rate of hatching among these three color rays. The dark color ray was not good result and the colorless ray was the worst 3.In the case of eggs of carp and gold fish, I can not recon.nize the difference of the rate of hatching among those color rays (Table 3 & 4). 4.According to the different fish species and kinds of color rays, there was some difference in the average of days of hatching and mean variation of days of hatching. On the whole, however, in the case of good percentage of hatching, the value of variation was small. © 1949, The Japanese Society of Fisheries Science. All rights reserved.