Tanakia lanceolata; spear bitterling
A species of cyprinid fish native to Japan. The name refers to its spear-like shape.
The spear bitterling is a species endemic to Japan, characterized by its slender body.
Rare kanji spelling; 槍 means 'spear' and 鱮 is a character used for bitterling-like fish. Mostly seen in scientific literature.
From 槍 (やり, 'spear') + タナゴ (たなご, 'bitterling'), referring to the fish's elongated, spear-like body shape.