Blenny
Amazing fact
Male blennies stay in or near the nest hole and guard their eggs until they hatch.
葛西臨海水族園
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An illustration based on the real animal.
A little discovery to share.
Male blennies stay in or near the nest hole and guard their eggs until they hatch.
THE REAL WORLD
The real Blenny
- Scientific name
- Alticus orientalis
- Japanese name
- ヤセタマカエルウオ
- Group
- Ocean animals
- Order
- Blenniiformes
- Family
- Blenniidae
- Genus
- Alticus
This fish lives on rocks where rough waves crash. Even though it is a fish, it hardly ever goes into the water.
When spray splashes over it, it hops away across the rocks. It can breathe through its skin even out of the water.
With comb-like teeth in its downward-facing mouth, it scrapes algae off the rocks to eat.
How the Blenny lives
Males raise their crests and dorsal fins and shake their heads broadly to court females. A female that accepts courtship follows the male’s guidance into a hole to lay eggs.
葛西臨海水族園Basic data
- Size
- Total length: about 12 cm
- Diet
- Algae on rocks
- Range
- Hachijojima and the Ogasawara Islands
Watch wild animals from a distance. Do not touch or feed them, and take care of the places where they live.
Names around the world
Names come from Wikidata and iNaturalist records. Where a language has no recorded name, we use the scientific name.
Sources and how we check
- 葛西臨海水族園 — ヤセタマカエルウオChecked: 2026-11-03
We check each fact against its source. The illustrations simplify how the real animal looks.
The classification (class, order, family, genus) follows Wikidata records, checked against GBIF. Classifications can change as research goes on.
The basic data are the values given in each source. They vary with how the animal is measured, whether it is male or female, and whether it lives in the wild or in captivity.
This page was translated from the original Japanese with the help of AI.
Report a mistakeWhen you meet the Blenny, look for this
- Look for the triangular crest on a male’s head.
Animals do different things from day to day, so you may not always see this.
葛西臨海水族園EXHIBIT INFORMATION
Places that keep or show the Blenny
Zoos, aquariums and other places whose official websites say they keep or show this animal.
Kanto
Displays can change with the animals’ health and the seasons. Check each facility’s official website before you go.
RELATIVES
Others in Blenniidae
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