Whitespotted pygmy filefish
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An illustration based on the real animal.
A little discovery to share.
Male whitespotted pygmy filefish follow a female in a line before spawning.
THE REAL WORLD
The real Whitespotted pygmy filefish
- Scientific name
- Rudarius ercodes
- Japanese name
- アミメハギ
- Group
- Ocean animals
- Order
- Tetraodontiformes
- Family
- Monacanthidae
- Genus
- Rudarius
A filefish that stays small even when fully grown. It lives in shallow rocky areas with seaweed and in eelgrass beds.
It swims by rippling its dorsal and anal fins. It eats small crustaceans and other tiny animals.
When it rests at night, it holds onto seaweed or eelgrass leaves with its mouth so it won't be swept away.
How the Whitespotted pygmy filefish lives
During the breeding season, females begin feeding at dawn. It pecks at organisms attached to surfaces. It lays pale blue eggs on seagrasses and seaweeds. A parent blows fresh seawater over the eggs and guards them until they hatch.
東京大学いおワールドかごしま水族館Basic data
- Size
- Total length: 6 cm
- Diet
- Small crustaceans and other foods
- Range
- South of the Boso Peninsula
Where the Whitespotted pygmy filefish has been recorded
Records: GBIF.org (CC0 and CC BY 4.0 records, retrieved 2026-11-07). Map: Natural EarthSee the records on GBIF
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
- 日本語
- アミメハギ
- 简体中文
- 粗皮鲀
- 繁體中文
- 粗皮魨
- 한국어
- 그물코쥐치
- Português (Brasil)
- Peixe-porco-anão
- Русский
- Японский рудар
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 — アミメハギChecked: 2026-11-03
- 市立しものせき水族館 海響館 — アミメハギChecked: 2026-11-07
- いおワールドかごしま水族館 — アミメハギChecked: 2026-11-07
- 東京大学 — アミメハギの繁殖行動に関する研究Checked: 2026-11-07
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 Whitespotted pygmy filefish, look for this
- Look for its seaweed-like body color.
Animals do different things from day to day, so you may not always see this.
市立しものせき水族館 海響館EXHIBIT INFORMATION
Places that keep or show the Whitespotted pygmy filefish
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 Monacanthidae
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