Abstract
The fresh-water fish, Oryzias latipes was bred at the temperature 10°C and 25°C (control). The changes of the liver cells were examined with the electron microscope.
1. When the breeding lasts long, the same chondriosphere just as seen in the case of abnormal conditon, such as of high temperature and starvation, begins to be observed in the liver cells of the fish.
2. The lipid contents of the liver cells increase in the fish bred at 10°C, which are less than in those bred at 15°C. Generally speaking the lipid increases as the temperature gos up.
3. The aspect of the endoplasmic reticulum depends on the physiological condition of the hepatic cell. Its characteristic figures are maintained in those bred at 10°C.
4. Parts of high electron density of cytoplasma are seen the least in the fish bred at 30°C, the degree being related to the material contents, water contents and especially to the pH of the cell, and at too high or too low temperature pH lowering comes about.
5. In the fish at 10°C the mitochondria in the liver cells decrease in number.
