Length-weight relationships of six Nemacheilid fish species (Teleostei: Cypriniformes) from different rivers of Manipur,India

The length-weight relationships (LWRs) of six Nemacheilid species (Schistura chindwinica, S. fasciata, S. khugae, S. minuta, S. reticulata and S. rubrimaculata) have been analyzed. Fish samples were collected on quarterly basis from March 2018 to February 2019. Sampling was performed using cast nets (mesh size 5–10 mm; about 50 sq m area covered each time and water depth was 4 ft approx.), and electrofishing (Ultrasonic Inverter Electro Fisher, 24 volts, 4 m) in the day time. The total length (TL) of individual fish was measured to 0.1 cm with a digital caliper and body weights (BW) were measured to 0.001 g with digital electronic balances. The parameters for the LWR equations were calculated, and the respective statistics such as the 95% confidence interval for parameters “a” and “b” are provided as well as the coefficient of correlation. For five species a new maximum total length has been documented.     

中国澜沧江南鳅属鱼类一新种

2001年7月,于澜沧江下游支流勐腊县境内的南腊河中采获一尾南鳅属(Schistura)鱼类标本,经鉴定为一新种。命名为版纳南鳅(S.bannaensissp.nov.)。其主要鉴别特征:侧线完全;尾鳍叉形,两叶稍尖,下叶稍长于上叶;胸腹鳍均较短小,胸鳍长约为胸鳍和腹鳍基部起点之间距离的一半;腹鳍末端后伸不达肛门,其长约为腹鳍基部至臀鳍基部起点之间距离的一半;颊部无斑;体侧有4个醒目的棕褐色宽横斑,由背部延伸至腹面;横斑显著,在侧线以下较窄,其宽度等于或小于斑纹间距;在侧线以上较宽,其宽度远大于斑纹间距;沿体侧无黑色纵纹。       

南鳅属鱼类一新种及南鳅属评述

记述了南鳅属鱼类一新种－－异颌南鳅Ｓｃｈｉｓｔｕｒａ ｈｅｔｅｒｏｇｎａｔｈｏｓ ｓｐ．ｎｏｖ．,用作新种描述的模式标本共７属,其中正模标本１属,体长８０．０ｍｍ,编号８８１０２４０;副模标本６属,体长９５．０－１０５．０ｍｍ,编号８８１０２４１、８８１０２４１、８８１０１５０￣８８１０１５３。１９８８年采自云南省勐腊县的那着和曼庄,属澜沧江下游支流南腊河。所有模式标本均保存于中国科学院水生生物研     

Schistura sexnubes, a new diminutive river loach from the upper Mekong basin,Yunnan Province,China (Teleostei：Cypriniformes：Nemacheilidae)

An ichthyofaunistic survey of Mekong tributaries in Lincang Prefecture, Yunnan Province, China yielded a new species of nemacheilid loach, herein described as Schistura sexnubes species nova. The new species is readily distinguishable from its congeners by the following combination of characters: 8+8 branched caudal fin rays, an incomplete lateral line, a dissociated caudal bar, a shallow caudal peduncle depth (7.6%-9.6% SL; respectively caudal peduncle 1.76-1.95 times longer than deep), a diminutive size of less than 50 mm SL, and no sexual dimorphism. A dorsocephalic pattern consisting of a black, forward directed V-shaped formation located between the nares, and a white, ovoid blotch on the upper operculum serves as an autapomorphy.     

A new species of gravel-dwelling loach (Ostariophysi: Nemacheilidae) from the Nepalese Himalayan foothills

Turcinoemacheilus himalaya, new species, is described from the Koshi and Gandaki River basins of Nepal. The new species is distinguished from its hypothesised congener, Turcinoemacheilus kosswigi, from the Euphrates, Tigris and Karoun basins of the Middle East, by the presence of small scales on the posterior half of its body (v. absence of all scales), its shorter caudal peduncle (caudal peduncle length 12-15% standard length, L(S) v. 16-23), its shorter snout (snout length 28-36% head length, L(H) v. 40-49) and by features of its colour pattern, including the presence of small irregularly shaped dark grey markings over the lateral body surface. Turcinoemacheilus himalaya is known to date only from Nepal.     

中国条鳅新纪录种——Schistura porthos Kottelat,2000(英文)

在对澜沧江的亚流域罗梭江支流南星河的考察中,采集到一个中国条鳅新记录种。该物种经鉴定为Schistura porthos Kottelat,2000。该物种在罗梭江亚流域的发现延伸了其分布范围。