Pleuronichthys cornutus (Temminck & Schlegel 1846)

This species is distinguished by the following characters: scale length (trunk area) less than 1.23% of SL, the whole scale outline fan-shaped, exposed margin rhombic; scales non-deciduous, longitudinal and vertical scale rows essentially regular; upper eye area usually less than lower eye area, area ratio 0.70–1.08; central longitudinal scales 88-105, scales below lateral line 59-74, abdominal vertebrae 12-14 (usually 13) (Ref. 126213).

Dorsal soft rays (total): 71 - 83; Analsoft rays: 50 - 62; Vertebrae: 36 - 39

Occurs mainly on sandy bottoms in shallow coastal waters (relatively dominant over P. cornutus in Tokyo and Ise Bays, and the Seto Inland, Ariake and Yatsushiro Seas. Probably have some tolerance for reduced salinity forit is reported to be occasionally occurring in river estuaries in China and Korea and brackish waters in Japan (Ref. 126213).

分布於西北太平洋區，由朝鮮半島、日本北海道以南至台灣。台灣西部、北部及東北部與澎湖海域均有產。

一般以底拖網漁法捕獲較多，手釣法則在秋、冬季節較能釣獲。多以紅燒或油煎食用。

體高寬，呈菱形，側扁，背緣及腹緣均隆起；兩眼均位右側，眼大，且前方均各有一短棘。吻甚短鈍；眼間隔頗窄，兩側各具一強棘。口小；唇厚，具橫褶；上頜骨短，僅達眼睛前緣下方，下頜不突出；無副上頜骨；盲側之頜骨齒較眼側發達，盲側具2-3列，呈絨毛狀，眼側細小或無齒；鋤骨與腭骨無齒。鰓膜與峽部分離。體兩側被小圓鱗，背、臀鰭鰭條被鱗；兩側側線均發達，側線鱗98-110。背鰭起始於上眼中央，軟條數76-82；臀鰭起點在胸鰭基下方，軟條數54-62；兩側均具胸鰭，中央軟條分支，眼側者較盲側長；腹鰭在前鰓蓋緣後方；尾鰭圓形。體紅褐色，頭部、軀幹部及各奇鰭下方均密布深褐色圓點或不規則點，胸鰭及尾鰭後半部黑褐色；盲側乳白色。

近海砂質底床底棲魚類，棲息深度可達120公尺。冬季生殖季節時，會遷移至淺海域產卵。肉食性魚類，多靜伏在海床上，伺機捕食甲殼類、貝類及小型魚類。

The ridged-eye flounder (Pleuronichthys cornutus), also known as the frog flounder, is a species of flatfish in the family Pleuronectidae. It is a demersal fish that lives on sand and mud coastal bottoms at depths of between 2 and 170 metres (6.6 and 557.7 ft). Its native habitat is the temperate waters of the north-western Pacific, from southern Hokkaido to the Korean peninsula, the Bohai Sea, the Yellow Sea and the South China Sea. It can grow up to 30 centimetres (12 in) in length, and can weigh up to 1 kilogram (2.2 lb).