细鳞鲑（学名：Brachymystax lenok）为辐鳍鱼纲鲑形目鲑科细鳞鲑属的鱼类，俗名金板鱼、闾鱼、花鱼。

身体延长、侧扁，长达0.8米；背侧为紫灰色，具有黑色小圆斑，银灰色腹面，生殖期身体颜色变暗，并出现红色斑块；口较小，牙齿多，舌上也有牙齿；鳞细小。

Brachymystax lenok, the sharp-snouted lenok, is a salmonid fish distributed in rivers and lakes in northeastern Asia. It formerly included the blunt-snouted lenok, but recent authorities typically treat the latter as a separate species, B. tumensis, based on differences in morphology and genetics.