Assessment of Coilia mystus and C. nasus in the Yangtze River Estuary, China, Using a Length-Based Approach

An assessment of the stock status and historical changes in abundance Coilia mystus C. nasus Yangtze River Estuary, China, was carried out based on field surveys conducted 2019–2020 published length-frequency (L/F) data from earlier periods. These two species’ current past relative biomasses (B/BMSY) were estimated using a length-based Bayesian biomass estimation method (LBB). The LLB also their asymptotic lengths (Linf), optimum mean at first capture (Lc; Lopt_c), ratios natural fishing mortality to growth (M/K; F/K). In response increasing pressure, both maximum declined, along with B/BMSY ratio, which declined for 1.7 1982 0.47 2020 2006 (or earlier) 0.17 2020. assessments show that species are overfished, impacted more severely than mystus. prospect recovery these is briefly discussed. This contribution will help toward management population provides basis evaluating effect 10-year ban River.