noun
pale chub; freshwater minnow
A small freshwater fish (Zacco platypus) native to East Asia, often found in clear streams. The name is usually written in katakana.
オイカワは日本の川でよく見られる小魚です。
The pale chub is a small fish commonly seen in Japanese rivers.
釣り人がオイカワを釣り上げた。
The angler caught a pale chub.
The name likely derives from the fish's habit of chasing (追う) in the river (川), but the exact origin is uncertain.