Yoshinobori (common freshwater goby)

Japanese: ヨシノボリ(葭登) - ヨシノボリ（英語表記）common freshwater goby

A fish of the family Goby in the order Perciformes (illustration). It is found in the Korean Peninsula, Taiwan, and eastern Asia, and is commonly seen throughout Japan, where it has many local names, including Gori (Kinki region). Its body color is yellowish brown or grayish brown overall, with various markings, but these vary significantly depending on the region. It also lives in a variety of habitats, including rivers, lakes, gravel, and muddy areas. Its pectoral fins are large, with the upper three or four rays free from the membrane. Adult males have a long first dorsal fin. The spawning season is from June to August, when the males' body color turns black and the tip of their dorsal fin turns red.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

スズキ目ハゼ科の魚（イラスト）。朝鮮半島，台湾，アジア大陸東部に分布し，日本の全国各地にふつうに見られ，ゴリ(近畿地方)をはじめ地方名も数多い。体色は全体に黄褐色ないし灰褐色をなしさまざまな斑紋が見られるが，地域によって著しく異なる。また，生息域も河川，湖沼，れき地，泥地とさまざまである。胸びれが大きく，上端3～4条は膜から遊離している。雄の成魚では第1背びれが長い。産卵期は6～8月ころで，雄は体色が黒くなり，背びれの先端が赤くなる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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