Four stretched mesh sizes (30, 34, 38, and 40mm) were used to examine the mesh selectivity of gillnets for the keeled mullet (Liza carinata). In 2021, the experimental fishing operations were carried out in the Suez Bay and Gulf of Suez, the Red Sea. Selectivity on L. carinata was evaluated with the PASGEAR ́ software's SELECT technique (version 2017). The length frequency data were fitted using five different models: bi-normal, normal location, gamma, normal scale, and lognormal distributions. It was found that the normal location model is the ideal selectivity of the gillnet data for Liza carinata. The optimal lengths (100% retention probability) for the 30, 34, 38, and 42mm mesh sizes were 13.6, 13.7, 14.3, and 16.3cm, respectively, for the selectivity curves on the normal location model. According to the study, in order to prevent overfishing of the fish population, gillnets employed in the Suez Bay fishery should have a mesh size of at least 38mm for Liza carinata.