Last modified on 23 August 2014, at 13:42



Kanji in this term
Grade: S Grade: S Hyōgaiji


Originally a compound of (ni, resembles) +‎ 五郎鮒 (gorōbuna), short for 源五郎鮒.

Variously spelled in kanji as 煮頃鮒 or 似五郎鮒. The 煮頃 spelling for nigoro is likely ateji. Meanwhile, the 似五郎鮒 spelling points to the likely derivation: this spelling parses out to "resembling (gen)gorō-buna", and as the nigorobuna grows to sizes of 30cm or longer, it begins to resemble the 源五郎鮒 (ゲンゴロウブナ, gengorōbuna), a closely related species also endemic to the lake.

Like many biology terms, this word is often spelled in katakana, as ニゴロブナ. When written in kanji, the 煮頃鮒 spelling is more common.


  • Kun'yomi
  • IPA(key): [niɡo̞ɺ̠o̞bɯᵝna̠], [niŋo̞ɺ̠o̞bɯᵝna̠]


煮頃鮒 (hiragana にごろぶな, katakana ニゴロブナ, romaji nigorobuna)

  1. nigorobuna (Carassius auratus grandoculis), a type of (funa, crucian carp), an edible freshwater ray-finned fish related to carp and goldfish, endemic to Lake Biwa in Japan


  • 1981, Hitsudai Hitomi, d. 1701, Hatsuko Yoshii & Shimada Isao editor, 本朝食鑑 (Honchō Shokkan)[1] (in Japanese), Heibonsha, page 267:

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