In addition, adult fish that migrate to the sea for spawning develop a nuptial coloration of black and silvery white on the dorsal and abdominal sides, respectively, and the pectoral fins become enlarged.
また、産卵のため海に下った成魚は背中側が黒色、腹側が銀白色になる婚姻色を生じ、胸鰭が大きくなる。