The kanji 鮎 represents the "ayu" fish, also known as sweetfish. It's specifically used to refer to this type of freshwater fish, prized for its delicate flavor and fragrance.

・On-yomi (音読み): N/A (Generally, this kanji is not used with an On-yomi reading.) ・Kun-yomi (訓読み): あゆ (ayu)

⚫︎鮎の塩焼き Translation: Grilled ayu with salt (a common way to prepare the fish) ⚫︎鮎釣り Translation: Ayu fishing ⚫︎清流の鮎 Translation: Ayu of a clear stream

The kanji 鮎 is a phono-semantic compound (形声文字, けいせいいもじ). The left side is a radical related to fish (魚, うお) providing the meaning and indicates this character's relation to aquatic life. The right side is a phonetic component (占, せん) lending the sound, although the sound is not used.