In Morocco, the Atlantic bonito is one of the most landed species on the South Atlantic, with an average catch of about 4,000t per year. To assess the stock of this species, a study was conducted addressing three models of Sarda sarda (Bloch,1793), based on size frequencies. Data were determined with respect to the series of size data collected during the period from 2014 to 2019. The species under study, specifically the spawning individuals were exposed to continuous pressure over time. The LBSPR (Length bases spawning potential ratio) model displayed an exploitation rate of 69%, whereas the catch curve showed an exploitation rate of 68%. Interestingly, the most optimistic model length cohort analysis/yield per recruitment (LCA/YPR) recorded a 54% exploitation rate, which is still worrying.