red cap fish (oranda)

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An oranda is a breed of goldfish characterized by a prominent bubbly-like hood encasing its head. The hood or headgrowth (also known as wen) encases the whole head except for the eyes and mouth.

When it was first imported from China to Japan it was mistakenly thought to be native to Holland, and was therefore dubbed the "Dutch Ironmask" (オランダ獅子頭), from which its English name "oranda" derive