The ide (Leuciscus idus), or orfe, is a freshwater fish of the family Cyprinidae found in larger rivers, ponds, and lakes across Northern Europe and Asia.

[4] The generic name Leuciscus is derived from the Greek word leykiskos, which means "white mullet".

When they are small, ide have dark backs and silvery sides, but older fish develop a golden sheen along the flanks.

[5] As a popular ornamental fish, it was introduced to Great Britain in 1874[9] and is now widespread in England and Wales, but only has a localised distribution in Scotland.

The fish then return to the rivers in the autumn, where they remain close to the mouths and in the lower reaches throughout the winter.

[6] The smaller fish, larvae, and juveniles occupy a wide variety of shoreline habitats to feed, and they leave the shore areas and move into deeper waters as they grow larger.

The ide prefers clear, warmer water, and is not as tolerant of eutrophication as some related species.

Ide spawn in running water, so the obstruction of rivers by dams and other man-made objects can negatively affect this fish.

As they grow quite large, they are not considered to be suitable for indoor aquaria, and they recommended to be kept outside as a shoal in a pond.

[13] In their native range, they are popular as a quarry for anglers; in eastern Europe, the ide is regarded as edible and is prized as a food fish,[14] and are netted and sold commercially along the Danube.