キス卵発生に及ぼす温度変化の影響〔英文〕

概要

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The purpose of the present investigation is to describe the effects of short-term temperature changes on the development and survival of eggs of the Japanese whiting Sillago japonica. Before the measurement of thermal tolerance, the normal developmental stages from fertilization to hatching were described and divided into 27 stages. Temperature changes were brought about by transferring eggs from seawater at an incubation temperature of 24.0°or 27.0°C to seawater at shock temperatures of 10°, 15°, 20°, 24°, 27°, 32°, 34°, 36°, 38°, 40°, or 42°C and them maintaining the eggs at the shock temperature for 15 minutes. Dropping the temperature from 24°C to 10°C had no effect on the developmental process. But the elevation of temperature affects development particularly during two periods, namely, “from fertilization to blastula” and “from middle gastrula to formation of optic vesicles”. During the latter period, the minimum shock temperature after which 50% of eggs hatched normally had a comparatively high value for the second spawning period, and dropped in value for the third and final spawning period.
社団法人日本水産学会の論文