Accessing the risk of overfishing faced by mullet fisheries and its ongoing economics in Pakistan

摘要

In this study, catch statistics of mullets are first time evaluated to know their exploitation status and ongoing economic implications. Catch and effort (CE) figures of mullets acquired from Sindh, Pakistan was statistically evaluated by employing surplus production models (SPMs), non-equilibrium versions, through two famous fishery related software, viz., catch and effort data analysis (CEDA) and a stock production model incorporating covariates (ASPIC). In total three SPMs, i.e., Fox, Schaefer and Pella-Tomlinson were used to investigate CE statistics, 1995 to 2012. Obtained results reveal that catch per unit effort (CPUE) has considerably dropped from 0.206 (1995) to 0.055 (2012). CEDA estimates of maximum sustainable yield (MSY) remained conservative as they were calculated between 5100 to 6500 t against ASPIC for which estimates of this parameter remained between 5800 and 7600 t. Considering the results, it can be concluded that mullet fishery is experiencing overexploitation (OE). This OE is an indicator of economic losses by increasing costs and decreasing profits. Thus, mullet resource conservation is necessary for its long-term economic utilization. Therefore, it is suggested that the target reference point (TRP) with respect to harvest should be between 5100 to 5500 t. However, this study is a preliminary study, hence; further in-depth studies are suggested before making and implementing any management plan for mullet fishery in Sindh, Pakistan.