Opsariichthys bidens Günther, 1873
马口鱼,  馬口魚,  马口鱼
Opsariichthys bidens
photo by CAFS

Family:  Xenocyprididae (East Asian minnows)
Max. size:  20.5 cm TL (male/unsexed); max.weight: 58.4 g
Environment:  benthopelagic; freshwater
Distribution:  Asia: Laos, Viet Nam and East Asia.
Diagnosis:  Dorsal soft rays (total): 10-10; Anal soft rays: 11-12; Vertebrae: 41-42. Adult male with projecting anal fin rays; conspicuous symphyseal knob in lower jaw; origin of dorsal fin slightly in front of anal origin; sexual dichromatism, female with plain body, male with irregular dark bars (Ref. 43281). Caudal peduncle scales modally 18; 19-21 pre-dorsal scales; 9 scales above lateral line; and 3 scales below the lateral line (Ref. 95038).
Biology: 
IUCN Red List Status: Least Concern (LC); Date assessed: 06 October 2011 Ref. (124695)
Threat to humans:  harmless
Country info:  Recorded from from the Mekong River system in Yunnan (Ref. 38630), Zhujiang River (= Pearl River) drainage of Guangdong Province, Jianjiang River drianage and Hainan Island all drainage (Ref. 33345). Introduced from its native range to other regions in the country (stocked in all kinds of inland waters) (Ref. 55380). Known from Dongjiang River driangage, Beijiang River draingae; Hainan Dao Qiongzhong, Yunnan Hekou. Guangxi Longzhou. Guangdong Heping. Fujiang. Zhejiang. Hubei Chongyang. Guizhou Guiyang, Sichuan Baxian. Gansu Jiuquan. Shandong Jinan (Ref.33782). Also Ref. 35840, 95038.

Entered by: Torres, Armi G. - 13.07.97
Modified by: Reyes, Rodolfo B. - 23.11.16
Checked by: Torres, Armi G. - 22.09.02

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