Length‐length and length‐weight relationships of ten fish species in Yichang reach of middle Yangtze River below Gezhouba Dam, China
Shu Ni, Zhonghua Duan, Pengcheng Lin, Chunling Wang, Xin Gao
Abstract
Length-length (LLRs) and length-weight relationships (LWRs) were described for ten fish species inhabiting the Yichang reach in middle Yangtze River below Gezhouba Dam, China. Fish were sampled using drifting gillnets (30–40 m long ×1.0–1.5 m high, mesh size: 20, 40 and 60 mm) and stationary gillnets (40–60 m long ×1.8–2.0 m high, mesh size: 20, 40, 60, 80, 100 and 140 mm) from October to next January each year between October 2016 and January 2021. All fishes were measured in the field immediately after collection for total length (TL) and standard length (SL) to the nearest 0.1 cm and for body weight (BW) to the nearest 0.1 g. There was strong correlation between length and weight of all ten species (r2 > 0.95). The values of parameter b in LWRs ranged from 2.871 to 3.480. The results provided new data for FishBase and for establishing conservation measures of fish resources after fishing closure in the Yangtze River.