Ayu
| Ayu | |
|---|---|
 |
|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Superclass: | Osteichthyes |
| Class: | Actinopterygii |
| Subclass: | Neopterygii |
| Infraclass: | Teleostei |
| Superorder: | Protacanthopterygii |
| Order: | Osmeriformes |
| Suborder: | Osmeroidei |
| Superfamily: | Osmeroidea |
| Family: | Plecoglossidae |
| Genus: |
Plecoglossus Temminck & Schlegel, 1846 |
| Species: | P. altivelis |
| Binomial name | |
|
Plecoglossus altivelis (Temminck & Schlegel, 1846) |
|
The ayu (アユ, 鮎, 年魚, 香魚?) or sweetfish, Plecoglossus altivelis, is a species of fish. It is the only species in the genus Plecoglossus and family Plecoglossidae. It is a relative of the smelts and other fish in the order Osmeriformes.
Native to East Asia, it is distributed in the northwestern Pacific Ocean along the coast of Hokkaidō in Japan southward to the Korean Peninsula, China, Hong Kong and northern Vietnam. It is amphidromous, moving between coastal marine waters and freshwater lakes and rivers. A few landlocked populations also exist in lakes such as Biwa. It is an introduced species in Taiwan.
The name "sweetfish" was inspired by the sweetness of its flesh. In reference to its typical one-year lifespan, it is also written as 年魚 ("year-fish"). Some individuals live two to three years. The ayu is the prefectural fish of Gunma Prefecture and Gifu Prefecture.
Two to threesubspecies are recognized by some authors. Others do not distinguish the subtaxa.
Subspecies include:
An omnivore, the ayu feeds on algae, crustaceans, insects, sponges, and worms. It feeds on algae that accumulates on the rocks, scraping it off the rocks with their saw-shaped teeth.
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Wikipedia