Scientific Name
Opsariichthys pachycephalus
Opsariichthys pachycephalus粗首馬口鱲
by: Lab of Fish Ecol. and Evo., BRCAS
Author Günther, 1868 Depth 0 - 10M
Chinese 粗首馬口鱲 Poisonous Fish No 
Family_Chinese 鯉科 Economic Fish No 
Family F102 Cyprinidae Edible Fish Yes  Chinese In Mainland China 厚頭馬口魚 
Max Length 16 cm  Aquarium Fish Yes  Common Name 溪哥仔(幼魚及雌魚)、紅貓(雄)、苦槽仔、闊嘴郎、粗首鱲 
Distribution in World Taiwan [Endemic in Taiwan]   Distribution in Taiwan North、Middle、South 
Habitats Fresh water  Holotype Locality Taiwan 
Synonyms Zacco pachycephalus, Zacco taiwanensis   
Reference 臺灣魚類誌(沈等, 1993);臺灣淡水及河口魚類誌(陳&方, 1999);臺灣淡水魚類-壹 鯉形目(陳&張, 2005)  沈世傑 編 Shih-Chieh Shen ed. 1993 Wang, H.Y. etc. 1999 陳義雄,方力行 1999 陳義雄, 張詠青, 邵廣昭 2005 
Specimen List ASIZP0054186. ASIZP0057061. ASIZP0057109. ASIZP0057110. ASIZP0057992. ASIZP0058000. ASIZP0058064. ASIZP0058066. ASIZP0058067. ASIZP0058127. ASIZP0058456. ASIZP0058546. ASIZP0058551. ASIZP0062066. ASIZP0062068. ASIZP0062073. ASIZP0062075. ASIZP0062086. ASIZP0062089. ASIZP0062930. ASIZP0064641. ASIZP0064642. ASIZP0065752. ASIZP0072570. ASIZP0072571. ASIZP0074372. ASIZP0074399. ASIZP0074415. ASIZP0074420. ASIZP0074423. ASIZP0074656. ASIZP0074883. ASIZP0075002. ASIZP0801321. ASIZP0805253. ASIZP0805254. ASIZP0911321. BMNH1865.5.2.31-34Paralectotype. BMNH1865.5.2.60Lectotype. ...List all 203 records... 
Barcode2011-10-03,張家豪,CO1,100% 2011-10-03,張家豪,CO1,100%
Common Name Taiwan chub; Taiwan freshwater minnow; Thickhead chub 
Redlist Status NL Not in IUCN Redlist     
Characteristic Head large. Snout short. Eye large, on upper side of head. Mouth large and protractile; posterior end of upper jaw reaches midline of eye. Body elongated, posterior laterally compressed; dorsal and ventral profile slightly arched. Barbels absent. Scales moderately large; lateral line complete and curved above pelvic fin origin; head naked. L.l.:48-55; dorsal fin rays:3+7; pelvic fin rays:1+7; anal fin rays:3+9. Dorsal fin origin at midline between snout tip and caudal peduncle end; pectoral fin end distant from pelvic fin origin; pelvic fin at lower side of body; anal fin rays long, the longest reaches caudal peduncle end; caudal fin forked. Dark grayish dorsally, side and belly silvery white. 10 or more vertically bluish stripes on side of spawning male.
habitats Primary freshwater fish, prefers running water at lower and middle reaches, but also can be found in lake and backwater of rivers. The young polyphagia and turn to carnivorous when grow up. 
Distribution Endemic to western portion of Taiwan, had been introduced to eastern portion. Some adverse impacts due to introductions had been reported. 
Utility Popular with angling and aquarium (male).