魚類のイクチオフォヌス症に関する研究-3-ニジマスに感染したイクチオフォヌスの生活史

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1) ニジマスに感染したイクチオフォヌスの生活史を組み立てた。 2) その生活史は, 発育期, 前発芽期, 発芽および糸状体期, 繁殖期の4期から成っていた。 3) イクチオフォヌスの栄養体相は発育期の多核球状体であり, 糸状体は生殖器官の役割を果たしていることを明らかにした。また, 発芽のための準備段階として前発芽期を新しく設けた。The authors constructed the life cycle of Ichthyophonus in the infected fish tissues. The life cycle was made by four stages ; growing stage, pre-germination stage, hyphal development stage and proliferation stage. 1) Growing stage ; The youngest form is binuclear bodies. They grow to multinucleate-spherical bodies increasing in size, the number of nuclei, the cytoplasmic density and thickness of the cell wall. 2) Pre-germination stage ; The well grown, multinucleate-spherical bodies undergo the stage preparative to germination. They are characterized by a further increase in the nuclear number, concentration of the cytoplasm, plasmolysis, forming the pseudopodium-like protuberance of the cell and secretion of a new cell wall inside the primal one. 3) Hyphal development stage ; The cell of the spherical body germinates through its primal cell wall and extends to form the hyphal body. The extention of the hyphal body depends on the migration of the cell of the spherical body. The hyphal body is always walled by the newly secreted cell wall.4) Proliferation stage ; Hyphal spores are produced by the cell division of the hyphal bodies and released from open ends. The produced hyphal spores vary in the nuclear number from one to ten. From a histological observation, the authors might define the grorving stage of multinucleate-spherical bodies as the vegetative phase, and the hyphal body as a reproductive organism. The authors might demonstrate the presence of the pre-germination stage in the life cycle.
三重大学水産学部の論文

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窪田三朗
日本獣医畜産大

魚類のイクチオフォヌス症に関する研究-3-ニジマスに感染したイクチオフォヌスの生活史

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