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Ayu sweetfish

The ayu sweetfish, ayu or sweetfish, is a species of bony 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.

Subspecies
Two to three subspecies are recognized by some authors. Others do not distinguish the subtaxa. Subspecies include: • P. a. altivelis (Temminck & Schlegel, 1846) (ayu, sweetfish) • P. a. chinensis Y. F. Wu & X. J. Shan, 2005 (Chinese ayu) • P. a. ryukyuensis M. Nishida, 1988 (Ryukyu ayu-fish) – endangered == Biology ==
Biology
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. Adults typically maintain a feeding territory, but the form restricted to lakes and associated streams is schooling.Most populations of this species are amphidromous and breed in the lower part of rivers during the autumn, laying their eggs in small pits they dig in the gravel. The eggs hatch shortly after and the larvae are carried downriver to the sea. They overwinter in coastal regions, staying there until the spring where the young fish typically are about long and move back to the rivers. Here they reach by the summer. In Japan, some populations live their entire life in freshwater, only moving between lakes and the associated streams where they breed. These have a more variable migration pattern, moving upstream from the lakes in the spring, summer or autumn. The form restricted to freshwater is considerably smaller than the amphidromous form. This is caused by differences in the availability of food. == Human uses ==
Human uses
The ayu is highly prized for its flavour, mostly consumed in East Asia. Its flesh is distinctively sweet, with "melon and cucumber aromas". The main methods for obtaining ayu are by means of fly fishing, by using a fish trap, and by fishing with a decoy which is known as ayu-no-tomozuri in Japan. The decoy is a living ayu placed on a hook, which swims when immersed into water. It provokes the territorial behavior of other ayu, which assault the "intruder" and get caught. The ayu is also caught by cormorant fishing. The practice on the Nagara River, where Japanese cormorants (Phalacrocorax capillatus) are used, draws visitors from all over the world. The Japanese cormorants, known in Japanese as umi-u (ウミウ, "sea-cormorant"), are domesticated birds trained for this purpose. The bird catches the ayu, stores it in its crop, and delivers it to the fishermen. Ayu is also fished commercially, and captive juveniles are raised in aquaculture before being released into rivers for sport fishing. In Japanese cuisine, a common method of preparing ayu (among other small fish) is to fold their bodies in a wave-like "swimming" shape, then skewer. The fish is then grilled with salt over charcoal to preserve the natural flavor of the fish. == Gallery ==
Gallery
File:Plecoglossus altivelis altivelis 釣れた稚鮎.jpg|Young P. a. altivelis File:Ayu no Shioyaki.jpg|Ayu no shio yaki (Ayu grilled with salt) File:Naturalis Biodiversity Center - RMNH.ART.464 - A very inaccurate picture of Plecoglossus altivelis - Yūshi Ishizaki - Cock Blomhoff Collection - pencil drawing - water colour.jpg|Watercolor illustration File:Ayu TamagawaChofu 0403241c.jpg|Swimming up a dam File:CWD Plecoglossus altivelis altivelis.jpg|With cold water disease. File:Ayuikedukuri.jpg|As sashimi File:Ayu (Sweetfish) tempura.jpg|As tempura File:Plecoglossus altivelis-01.jpg|Farmed ayu == See also ==
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