抄録
Soon after spawning the eggs of the Japanese Killifish, Oryzias la ?? ipes (TEMMINCK & SCHLEGEL) and the Dutch-Lion-Head Goldfish, Carassius auratus (LINNAEUS) were kept at various constant temperatures. The time required for hatching and the percentage of the hatched fry were observed. To obtain a series of constant temperatures a SENO-TAUT??'s serial in ubator was made use of, in which 6 constant temperatures ranging from about 11° to 30°C. for the eggs of the Japanese Killifish and 10 constant temperatures ranging from about 12° to 31°C, for the eggs of The Dutch-Lion-Head Goldfish were maintained. The results obtained may be summarized as follows:
1) Water temperatures for normal development of the eggs range
for the Japanese Killifish 18° to 30°C.,
and for the Dutch-Lion-Head Goldfish 15° to 23°C.
2) The relation between the temperature (θ) and the time in days required for hatching (T) may be expressed as given by HIGURASHI and TAUTI by the formula Teaθ=C, where a and C are constants specific to the eggs of the respective kind. The values of these constants found in the present experiment and those of Q10 calculated from them are
for the Japanese Killifish a 0.0799, C 1.923 and Q10 2.22,
and for the Dutch-Lion-Head Gordfish a 0.0933, C, 1.523 and Q10 2.54.
