金魚の鱗の成長および隆起線間隔におよぼす水温の影響〔英文〕
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概要
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1. Using two-year-old goldfish, the relationship between the scale growth and water temperature was studied with the aid of tetracycline labelling. The scale growth was measured on the fish which were cultured in the medium regulated to be the following four kinds of water temperatures, 12.5°, 17.5°, 22.5° and 27.5°C. 2. It was found that the scale growth was depending upon the water temperature at which the fish were cultured; that is, the mean growth in width per day was 1.3μ in the fish cultured at 12.5°, 4.9μ at 17.5°, 6.1μ at 22.5° and 6.6μ at 27.5°C. 3. The number of days required to form one ridge of the scale was more than 20 days at 12.5°, 7 days at 17.5°, 6 days at 22.5° and 5 days at 27.5°C. 4. Mean distance between the ridges formed on the individual scale was as follows; that is, 32.6μ in the group of 12.5°, 34.2μ in 17.5°, 33.1μ in 22.5° and 30.7μ in 27.5°C. Finally, in young goldfish the ridges are formed at regular intervals and not depending on the water temperature, in which medium the fish are cultured, so far as the scale grows on.
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