池沼公鱼〔Hypomesus olidus(Pallas)〕以浮游动物为主要食物,因而单位面积平均产量高,是日本湖沼的重要鱼类之一。它的产量仅次于鲫鱼和香鱼,据1973年统计,产量约达3595吨。因为渔获对象主要是当年鱼,所以渔获量随着年发生量而变动很大。池沼公鱼分布在太平洋岸千叶县以北、日本海岸岛根县以北的沿岸以及 Hypomesus olidus (Pallas) is one of the major fish species in Japan’s lakes and marshes because of its high yield per unit area with zooplankton as the main food. Its production is second only to the carp and sweetfish, according to 1973 statistics, the output is about 3595 tons. Since the catch is mainly of the year fish, the catches vary greatly with the annual occurrence. Pond marsh fish are distributed in the Pacific coast north of Chiba Prefecture, Shimane Prefecture, Japan coast north of the coast and