Length-weight relationships of three species in northern China

Length-weight relationships were estimated for three species (Triplophysa microphysa, Triplophysa zamegacephala and Gobio coriparoides) belonging to two families and two genera from northern China. Specimens were collected using trap nets (mesh size 1cm) in May, June and December 2017, and March 2018. Total length (TL) for each individual was determined to the nearest 0.1cm by digital slide caliper and each body weight (BW) to an accuracy of 0.1g using digital balance. The b-values for LWRs varied from 2.583 to 2.876 (r(2)>0.979). This biometric data and their relationships are relevant to the management and conservation for local fishes and fisheries.