Application of SPMs and BRPs to Access Overexploitation Risk Faced by Lutjanus johnii (Bloch, 1792) in Pakistan: A Sustainable Fishery Management Perspective
Application of SPMs and BRPs to Access Overexploitation Risk Faced by Lutjanus johnii (Bloch, 1792) in Pakistan: A Sustainable Fishery Management Perspective
Ana Mehak1, Muhammad Mohsin1* and Muhammad Ahsan Raza2,3
ABSTRACT
Managing fisheries sustainably in Pakistan depends heavily on monitoring industrial fishery operations as many fisheries stocks have been declared overexploited resulting in decreased economic contribution. This study assesses the fishery stock status of Lutjanus johnii, estimated for the first time in Sindh, Pakistan. In this regard, surplus production models (SPMs), non-equilibrium, analyzed fishery statistics from 2004 to 2017. ASPIC (A Stock Production Model Incorporating Covariates) and CEDA (Catch and Effort Data Analysis), computer-based and manually operated statistical routines, were used to apply SPMs to the data. Based on the ASPIC output, the maximum sustainable yield (MSY) was computed as 989 tons (t) in the Schaefer Model (S-M) and 873 t in the Fox Model (F-M). In S-M and F-M, the coefficient of variation (CV) and goodness of fit (R2) remained at 0.107, 0214, and 0.962, 0.978, respectively. Furthermore, ASPIC results highlighted decreased fishing mortality (F) and increased biomass (B). Meanwhile, in CEDA, MSY outputs along with R2 remained at 1051 t (0.718) for S-M and the Pella-Tomlinson Model (PT-M). S-M and PT-M MSY outputs remained the same at 1051 t (0.718) in CEDA. In contrast, F-M calculated these parameters at 849 t (0.941). Based on the results, it is clear that L. johnii is being overexploited in Sindh, Pakistan. To ensure sustainable harvesting of this fishery resource and long-term economic exploitation, current management measures should be strengthened along with further research.
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