ニジマス卵の発生中における数種無機質含量の変化について

概要

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Changes in the contents of various minerals have been followed during the development of rainbow trout, Salmo gairdnerii irideus. The wet weight of 100 eggs increased after fertilization by absorbing water and then decreased gradually as development proceeded. After hatching of the eggs the wet weight increased rapidly (Table 1). The percentages of sodium, potassium, silicon, calcium, and copper on dry basis increased after hatching (Table 2). As an individual egg changes in its wet weight during development, it is not correct to consider that the contents of various minerals expressed as percentages on dry basis indicate the exact changes taking place within the egg. Thus the changes in weights of minerals in 100 eggs were caluclated. As shown in Table 3, the contents of sodium, potassium, silicon, calcium, and copper increased after hatching out, among them sodium, potassium, and silicon being more remarkable, whereas phosphorus showed rather little increase and magnesium decreased more or less in larval fish.
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