卵黄嚢を有するカムルチー仔魚の發育並に餓死と温度との關係

概要

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Just hatched larvae of the Corean snake-head fish (Ophicephalus argus Cantor) were kept at various temperatures without supplying food and starved to death. The time required for absorbing the yolk completely and the duration of life from hatching to death were observed. To obtain a series of 10 constant temperatures ranging from about 13° to 30°C a Senô-Tautis serial thermostat was made use of, in each compartment of which was placed a glass tube containing about 60c.c. of water to receive each 20 specimens. The experiment was repeated twice with the results as summarised in the following lines: 1. Shorter time is required for both the processes above stated at higher temperatures and longer at the lower temperatures. 2. The relation of the duration of time T required for each process to the water temperature θ is expressed by the formula Teaθ=C, where a and C are constants specific to the kind of fish. The values of these constants found in the present experiment and that of Q10 calculated therefrom are for the absorption of yolk a 0.136, C 2.029 and Q10 3.90, and for the starvation to death ?? 0.076, ?? 2.055 and ?? 2.14. 3. When the larvae are reared at low temperatures such as from about 19° to 22°C, the rate of production of the deformed larvae seems to be raised as the temperature approaches a lower limit.