bitterling
Refers to small freshwater fish of the subfamily Acheilognathinae, especially the species Acheilognathus melanogaster. Common in ponds and slow streams in Japan.
I found a bitterling in the neighborhood pond.
タナゴは二枚貝に卵を産むことで知られている。
Bitterlings are known for laying their eggs in freshwater mussels.
Tokyo bitterling
Acheilognathus typus (species of bitterling-like cyprinid)
rosy bitterling
Katakana spelling is common for this fish name; the word is usually written in kana.
Hiragana spelling, also common.
Rarely used kanji form; not recommended for learners.
The origin of the word タナゴ is uncertain. It is a native Japanese name for this fish, with no clear kanji etymology.