Data-Limited Population-Status Evaluation of Two Coastal Fishes in Southern Angola Using Recreational Catch Length-Frequency Data

摘要: Excessive truncation of a population's size structure is often identified as an important deleterious effect exploitation, yet the on population persistence size-structure caused by exploitation not quantified due to data limitations. In this study, we estimate changes in eggs per recruit (EPR) using annual length-frequency samples over 9 year period assess two most recreational fishes southern Angola: west coast dusky kob (Argyrosomus coronus) and leerfish (Lichia amia). Using length- age-structured model, improve existing method fit type model EPR. The objectives methodological are add flexibility robustness approach for assessing status data-limited situations. Results indicate that presents very low levels EPR (5%-10% reproductive capacity absence fishing) 2013, whereas large inter-annual variability estimates suggest caution must be applied when drawing conclusions about its status. simulated length frequency with known parameter values, demonstrate recruitment decline overexploitation leads overestimation values. Considering estimated study species, limitation impossible true values may even lower than our estimates. It is, therefore, likely management action, such creation Marine Protected Areas, needed reconstitute population.