Acrossocheilus malacopterus, a new non-barred species of cyprinid from South China

Acrossocheilus malacopterus n. sp. is described from the Yuan Jiang (Red River) and Zhu Jiang basins in I South China. It is separated from other congeners by a combination of the following characters: an inconspicuously stripped body, 16 circumpeduncular scales, 47-49 lateral line scales, depth of caudal peduncle 7.8-9.3% SL, snout length 37.9-41.7% SL, dorsal-fin length 18.7-21.0% SL and last simple dorsal-fin ray slender with 8-10 fine serrations along posterior margin.

Acrossocheilus spinifer, a new species of barred cyprinid fish from south China (Pisces : Teleostei)

Acrossocheilus spinifer sp. nov. is described from the river basins in Fujian Province and the Han Jiang basin in Guangdong Province, south China. It is one of the barred Acrossocheihis species sharing five or six vertical bars on the flanks, with each bar being two scales in width. Acrossocheilus spinifer sp. nov. is morphologically most similar to Acrossocheilus wenchowensis. but distinguished from it by: a colour pattern of all vertical bars extending ventrally to the second scale row below the lateral line, and having the second bar placed posterior to the base of the last simple dorsal-fin ray, a blunt snout; and a stout, last simple dorsal-fin ray. Acrossocheilus spinifer sp. nov. resembles Acrossocheilus kreyenbergii and Acrossocheilus stenotaeniatus with which it shares a stout, last simple dorsal-fin ray with a serrated posterior edge, but is separated from both species by having a narrow median interruption in the lower lip, a lower jaw fully covered by the lower lip when viewed ventrally and the second vertical bar placed posterior to the base of the last simple dorsal-fin ray. The absence of a longitudinal stripe extending along the lateral line on the flanks in males readily distinguishes A. spinifer sp. nov. from Four other species, namely Acrossocheilus fasciatus, Acrossocheilus paradoxus, Acrossocheilus parallens, and Acrossocheilus jishouensis. (c) 2006 The Authors Journal compilation (c) 2006 The Fisheries Society of the British Isles.

六种鱼巴亚科鱼类线粒体细胞色素b 基因序列分析

测定了鱼巴亚科云南光唇鱼( Acrossocheilus yunnanensis) 、宽头四须鱼巴( Barbodes laticeps) 、抚仙金线鱼巴 ( Sinocyclocheilus tingi) 和滇池金线鱼巴( Sinocyclocheilus grahami) 4 种鱼类线粒体细胞色素b 基因DNA 序列402 bp ,结合已知的云南倒刺鱼巴( S pinibarb denticulatus yunnanensis) 和细尾长臀鱼巴( Mystacoleucus lepturus) 的同源 序列,组成1 个6 种代表鱼巴亚科5 属鱼类的数据集. 选用已知的云南鲴( Xenocypris yunnanensis) 作为外群,采用 邻接法、最大简约法和最大似然法构建了分子系统树. 结果显示: 倒刺鱼巴属( S pinibarbus) 和光唇鱼属 ( Acrossocheilus) 有较近的亲缘关系,四须鱼巴属( Barbodes) 和长臀鱼巴属( Mystacoleucus) 有较近的亲缘关系,而金 线鱼巴属( Sinocyclocheilus) 和它们的关系不能确定. 上述结果与它们的地理分布基本吻合.

赤水河上游云南光唇鱼年龄与生长研究

2007年10月至2008年5月间在赤水河国家级鱼类保护区上游的云南镇雄县坡头乡采集到云南光唇鱼(Acrossocheilus yunanensis)430尾(体长范围57mm～281mm),其中雄鱼77尾,雌鱼97尾,其余的性别不确定,样本为流刺网和电击捕获。通过鳞片对430号标本进行了年龄鉴定,首次对赤水河上游云南光唇鱼的年龄与生长特点进行了研究,分析了体长、体重、鳞径的关系及渔获物的年龄结构组成。所采集云南光唇鱼的年龄由0-5龄组成;体长与鳞径呈线性正相关关系,关系式为:L♀=0.0157R-0.0