Squalidus iijimae (Oshima 1919)

Distinguished from its congeners by the unique combination of the following characters: dorsal fin rays 3+7, anal fin rays 3+6, pectoral fin rays 1+13-14; lateral-line scales 34-35, predorsal scale rows 10-11; body robust, the transverse rows of papillae on snout loosely arranged and maxillary barbels short and about equal to 1/2 of eye diameter and body greenish-silver on dorsal and silver-white on ventral side; body scale pocket, with grayish posterior margin, has net-like patterns; body with a longitudinal grayish stripes; all fins translucent; dorsal and caudal in with minute black spots; other odd fins unmarked (Ref. 57944).

Dorsal soft rays (total): 10; Analsoft rays: 9

臺灣的特有種，分布於中北部之後龍溪、頭前溪及其支流等溪流。現生族群量已日漸稀少，是急需保育之物種。

小型魚類，數量較稀少，不具食用價值，或可當觀賞用魚。

體細長，稍側扁，尾柄較長，腹部圓。頭中大，頭頂稍隆起。吻略尖。眼大，上位。口斜裂，上頜較下頜為長。咽頭齒2列，齒式5.3-3.5。唇薄。有鬚1對。鰓耙退化，排列稀疏。體被中大型的圓鱗；側線完全而較平直，側線鱗數34-35，背前鱗 10-11。各鰭均無硬棘，背鰭軟條3(不分枝軟條)+ 7(分枝軟條)；臀鰭3(不分枝軟條)+ 6(分枝軟條)；腹鰭 7(分枝軟條)。體背側灰褐色，頭背部略呈灰黑色，腹側灰白；體側中央有一條不明顯之黑色縱帶，帶有金色光澤。體背側每個鱗片邊緣為黑色而構成網狀紋。背、臀鰭散在不規則排列之小黑點；其餘各鰭透明無斑點。

初級淡水魚。喜歡棲息於河川中下游水流較緩之潭區，以水生昆蟲、藻類和水生植物碎屑為食。

Squalidus iijimae is a species of cyprinid fish endemic to Taiwan.

Named in honor of zoologist Isao lijima (also spelled Ijima, 1861-1921), Science College, Imperial University of Tokyo.