魚類の適応変異に関する研究 : I. メダカ(Oryzias latipes T. & S.)の塩水適応 : 第3報実験的研究

概要

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The relation between resistance to artificical sea water and growth stages was observed, using cultured strain of the killifish (Oryzias latipes T. & S.). The main expcrimental results described in this paper are as follows: 1) Any Physiological changes were not observed within 120 hrs., so long as the concentration of artificial sea water used was less than 40 per cent (Salinity; 13.26‰). When artificial sea water was more concentrated than 40%, different features of resistance according to the different growth stages were observed. The fishes, just after yolk sacs having been absorbed, died within 3 hrs. in artificial sea water (Salinity; 33.13‰). 2) Death selection in artificial sea water was always completed within 60 hrs., and resistant in dividuals only could survive thereafter. 3) It is said that the fish having greater capacity of osmotic regulation has slways larger head in comparison with body length. This tendency was also ascertained in our killifish, but was not so conspicuous as stochastic analysis could show any significant difference.
社団法人日本動物学会の論文
1957-09-15