H
Hirohiko Kagawa
Researcher at Hokkaido University
Publications - 10
Citations - 969
Hirohiko Kagawa is an academic researcher from Hokkaido University. The author has contributed to research in topics: Japanese eel & Sperm motility. The author has an hindex of 10, co-authored 10 publications receiving 939 citations.
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Artificial induction of maturation and fertilization in the Japanese eel, Anguilla japonica
TL;DR: Repeated injections of salmon pituitary extract induced vitellogenesis in feminized, cultivated Japanese eels, and many fertilized eggs from cultivated eels are obtained using these techniques developed for female and male eels.
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Estradiol-17β production in amago salmon (Oncorhynchus rhodurus) ovarian follicles: Role of the thecal and granulosa cells
TL;DR: A two-cell-type model for the production of follicular estrogens, the thecal layer possibly contributing to estradiol-17β production by synthesizing androgens which are transferred to the granulosa layer and aromatized to est radiol- 17β is suggested.
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Production of leptocephali of Japanese eel (Anguilla japonica) in captivity
TL;DR: It is found that a slurry-type diet made from shark egg powder is suitable feed for captive-bred eel larvae and revealed for the first time the transition from the preleptocephalus to the leptocephali stage of the eel.
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Changes in plasma steroid hormone levels during gonadal maturation in female goldfish Carassius auratus
TL;DR: Levels of plasma estradiol-17β, testosterone, progesterone, 17α-hydroxyprogesterone,17α-OHprog and 17α, 20β-dihydroxy-4-pregnen-3-one and 17β-diOH Progestogens were assayed during gonadal maturation in female goldfish Carassius auratus which have an asynchronous ovary in which oocytes are found at various stages of development.
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Estradiol-17β production in isolated amago salmon (Oncorhynchus rhodurus) ovarian follicles and its stimulation by gonadotropins
TL;DR: Evidence is provided that gonadotropin directly controls estradiol-17β production in amago salmon follicles, and this work is the first to demonstrate that in vitro gonadotropic activity in oocytes surrounded by follicle layers of amago Salmon is regulated by a single substance.