This paper reports the length-weight relationships for six fish species belonging to the Cyprinidae from the middle of the Yalu Tsangpo River in China. Samples were obtained by electroshock and drift net fishing techniques (mesh size 2 cm 9 3 cm; 200 m net length) in April and September to October 2014. Length-weight relationships estimates for these species were not available in FishBase. A total of 737 specimens were used to estimate the a and b parameters. New maximum total lengths are also reported for six species. The r 2 values range from 0.98 to 0.99. Values of b vary from 2.88 to 3.19. n, sample size; min, minimum length (cm); max, maximum length (cm); bold, new maximum length record; a and b, parameters of the equation; CL 95% , 95% confidence limits; r 2 , coefficient of determination. U.S. Copyright Clearance Centre Code Statement: 0175-8659/2015/3105-956$15.00/0 J. Appl. Ichthyol. 31 (2015), 956-957

Summary Length–weight relationships were evaluated for nine fish species from the Tongjiang section of the Songhua River in China. A total of 675 fish specimens were collected from 4 May to 29 October 2014. Length–weight relationships for six fish species (Romanogobio tenuicorpus, Leuciscus waleckii, Opsariichthys bidens, Microphysogobio amurensis, Pelteobagrus ussuriensis and Misgurnus mohoity) were new to FishBase in 2015, but the length–weight relationships of P. ussuriensis was studied by Ma in 2015. New data on M. mohoity is offered, and this study also shows new maximum total lengths for three fish species. The r2 values ranged from .95 to .99. Values of b varied from 2.504 to 3.471.