A study on cultivation of mullet (Mugil cephalus) in one feddan earthen ponds (4200 m² each) was done. Twelve rectangular earthen ponds were used representing six treatments, three different stocking densities (SD₁, SD₂ and SD₃ being 10000, 12000 and 14000fish/feddan, respectively) within each of them two fish size (FS₁ and FS₂ , being 10.05 ± 0.12 and 20.03 ± 0.30 g,  respectively). Two replicates were used for each treatment. The duration of the experiment was 12 months. The treatment of 12000 fish / feddan with 20 g/ fish showed the best results of marketable size, net yield (6562.58kg/feddan) and highest profit index (1.54 L.E). Based on the obtained results, it could be recommended that the best fish size and stocking density of mullet (M.cephalus) are 20 g/ fish and 12000 fish/feddan to get the optimal marketable fish size and economical return under pond farm management conditions