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Ijiri Lab
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This lab studies how sex differentiation and sexual maturation work in fish, and applies the findings to seed production of eels and sturgeon.
AboutAbout the lab
Controlling fish sex and maturation.
Ijiri Lab studies how germ cells, the precursors of eggs and sperm, develop in fish.
The lab aims to uncover these mechanisms and create technologies that control sex differentiation and sexual maturation in fish.
Using mainly sturgeons, Japanese eel, and masu salmon, the lab focuses on gonadal endocrinology.
Members get a firsthand sense of the challenges at aquaculture sites, then carry out basic and applied research in the lab to solve them.
Key terms
- Sex differentiation
- The process by which the body develops as either male or female. Eels have not yet determined their sex at birth.
- Endocrine
- A system that releases hormones into the blood to regulate bodily functions.
- Oocyte maturation-inducing hormone
- A hormone that promotes egg maturation until the eggs are ready to be ovulated.
ResearchResearch themes
The lab aims to clarify the mechanisms by which fish germ cells develop and to develop technologies that control sex differentiation and sexual maturation. It studies tilapia, sturgeon, and eel, as well as the mechanism of egg maturation across fish species.
*Illustrative imageSex differentiation in tilapia
The lab aims to clarify the mechanism of sex differentiation in Nile tilapia and to make it easy to produce YY males (supermales) and YY females (sex-reversed supermales).
*Illustrative imageSex differentiation and all-female production in sturgeon
The lab is clarifying sex differentiation in sturgeon through gene expression and developing a method to produce only females (all-female production). It also aims to clarify the mechanism of the transition to sexual maturity.
*Illustrative imageEel eggs and sexual maturation
By examining at the molecular level the eggs of wild mature eels caught in the Mariana region, the lab aims to identify the molecules involved in the transition to sexual maturation.
*Illustrative imageHow hormones induce egg maturation
Across all fish species, the lab works to clarify how the hormone that induces egg maturation is produced.
MembersFaculty
- ProfessorShigeho Ijiri
- Assistant ProfessorRyohei Surugaya
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Japanese Eel (Yakushima)” Ffish.asia / CC BY 4.0 (cropped)
- Sex differentiation in tilapia: “Oreo nilo M jtg” W.A. Djatmiko (Wie146) / CC BY-SA 3.0 (cropped)
- Sex differentiation and all-female production in sturgeon: “130706 Schrems A )” weisserstier from Wien, Austria / CC BY 2.0 (cropped)
- Eel eggs and sexual maturation: “Civelle dans le Ruisseau du loc'h à Morgat (Finistère) partie aval saumâtre grandes marées 06” Lamiot / CC BY-SA 4.0 (cropped)
- How hormones induce egg maturation: “Dworshak NFH salmon eggs poured 23 November 2021” USFWS / Public domain (cropped)
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