池沼公鱼 chí zhǎo gōng yú

池沼公鱼（Hypomesus olidus）属鲑形目，胡瓜鱼科，公鱼属。俗称：黄瓜鱼。英文名：Pond smelt 。体细长稍侧扁，头小而尖，头长大于体高。口大，前位，上、下颌及舌上均具有绒毛状齿。上颌骨后延不达眼中央的下缘，眼大。鳞大，侧线不明显。背鳍较高，其高大于体高；脂鳍末端游离呈屈指状；胸鳍小；尾柄很细，其高度仅等于眼径，尾鳍分叉很深。背部为草绿色，稍带黄色；体侧银白色；鳞片边缘有暗色小斑；各鳍为灰黑色。

百度翻译提供：

The pond male fish (Hypomesus olidus) belongs to salmoniformes, Cucurbitaceae, and the male fish genus. Commonly known as: cucumber fish. English Name: pond smile. The body is slender and slightly flat, the head is small and sharp, and the head length is greater than the body height. Large mouth, anterior position, with villous teeth on the upper, lower jaw and tongue. The maxilla does not extend to the lower edge of the center of the eye, and the eye is large. The scale is large and the lateral line is not obvious. Dorsal fin is higher than body height; The terminal part of fat fin was free and flexed; Small pectoral fin; The caudal stalk is very thin, its height is only equal to the eye diameter, and the caudal fin forks deeply. The back is grass green, slightly yellow; Body side silver white; Dark spots on the edge of scales; Each fin is grayish black.