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Higuchi Lab (Aquaculture Biology Division)
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The lab studies how sea urchins gain body mass, in order to make use of the skinny urchins in isoyake-affected seas through aquaculture.
AboutAbout the lab
Turning isoyake urchins into a resource.
Project Assistant Professor ichiro Higuchi studies how the gonads of sea urchins grow larger, as well as sea urchin aquaculture.
Sea urchins are a high-end food, but they are also a problem because they eat seaweed down to nothing and cause isoyake (the loss of seaweed beds).
Urchins in isoyake-affected seas are skinny and have no commercial value. To put them to use through aquaculture, the lab is carrying out research toward developing formulated feed for sea urchins.
The lab works on both molecular biology research in the laboratory and aquaculture demonstration trials in the field.
Key terms
- Isoyake (barren grounds)
- A phenomenon in which seaweed communities disappear and the rocky seabed is left exposed. One cause is sea urchins eating seaweed down to nothing.
- Gonad
- The organ that produces eggs and sperm. In sea urchins, it is the part that is eaten (the edible part).
- Major yolk protein
- The main protein that accumulates in sea urchin gonads. It is considered important for gonad growth.
ResearchResearch themes
To make effective use of the unused sea urchins living in isoyake-affected seas by farming them, the lab conducts basic and applied research toward developing formulated feed. To this end, it aims to clarify how sea urchin gonads grow larger.
*Illustrative imageHow sea urchin gonads grow
Sea urchin gonads grow larger as proteins, sugars, and lipids are produced and accumulate. The lab aims to clarify how major yolk protein (MYP), considered especially important, is produced and accumulates in the gonads.
*Illustrative imageAquaculture of isoyake urchins
To farm and make use of urchins that are skinny and have no commercial value in isoyake-affected seas, the lab conducts research toward developing formulated feed for sea urchins, along with aquaculture demonstration trials in the field.
MembersFaculty
- Project Assistant Professorichiro Higuchi
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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: “Strongylocentrotus intermedius 1” Totti / CC BY-SA 4.0 (cropped)
- How sea urchin gonads grow: “Huevas de erizo servidas en la concha” Wilfredor / CC0 (cropped)
- Aquaculture of isoyake urchins: “Tripneustes ventricosus (West Indian Sea Egg-top) and Echinometra viridis (Reef Urchin - bottom)” Nhobgood (talk) Nick Hobgood / CC BY-SA 3.0 (cropped)
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（浦和寛 教授） ): “Mesocentrotus nudus” Dmitry Ivanov / CC BY 4.0 (cropped)
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