Systomus rubripinnis (Valenciennes 1842)

With 4 barbels (Ref. 43281); anterior maxillary ("rostral") barbels present (Ref. 12693); last simple dorsal ray osseous and serrated posteriorly; conspicuous black blotch on caudal peduncle; small, vertically elongated, black spot below dorsal origin; narrow dark band from upper extremity of gill opening to pectoral base; caudal fin orange red with a conspicuous broad black marginal stripe on each lobe; usually longitudinal rows of black spots along scale rows (Ref. 43281).

Dorsal spines (total): 4; Dorsal soft rays (total): 8; Analspines: 2; Analsoft rays: 5

Effects annual upstream non-reproductive and downstream reproductive migrations.

Occurs in rivers of all sizes, but mainly in smaller streams, canals and on floodplains. Occasionally found in impoundments, but usually stays in the flowing streams leading to the impoundment. Moves into seasonally inundated areas and breeds at the start of the rainy season. Young of the year appear in streams in July and August. Adults leave the floodplains when the water recedes in December or January (Ref. 12693). Captured from the wild for the ornamental fish trade in Thailand (Ref. 6459). Marketed fresh or made into prahoc along the Tonle Sap (Ref. 12693).

fisheries: minor commercial

原產於歐亞大陸、東南亞等地，屬於水族觀賞魚，經人為不當放流後，目前普遍分布於宜蘭縣境內的溪流下游及湖埤水域之中，在野外已能自然繁殖。

水族觀賞魚。

背鰭3(不分枝軟條)+ 8(分枝軟條)；臀鰭3(不分枝軟條)+ 6(分枝軟條)；胸鰭1(不分枝軟條)+ 14(分枝軟條)；腹鰭1(不分枝軟條)+ 8(分枝軟條)；側線鱗30-31。體略高而側扁，隨著成長，體高的比例越大，背緣線會明顯隆起。頭短而略呈三角形。眼大，具鬚2對。體被大型圓鱗。尾鰭為深叉狀，兩葉末端略尖。體背呈淺灰綠色，腹側呈灰白色。眼睛虹膜上半部為紅色。鰓蓋中央具有一個明顯的大型紅色斑；背鰭基部下方之體背側具有一個黑色斑塊；尾柄基部另具一個大型的黑色眼斑。各鰭呈淺紅色至橘紅色。幼魚體色較成魚鮮艷，鮮艷的鰭膜顏色隨著成長而逐漸變淡。

外來入侵種。初級性淡水魚。主要棲息於溪流下游緩流區及湖泊、埤塘的中下層水域；常成群出現，游動速度快。可生存於優養化程度高的水域。雜食性，以水生昆蟲、底藻及有機碎屑等為食。