This experiment was conducted to determine the appropriate fertilisation frequency for optimal wild microalgae growth in fertilising ponds. These wild microalgae serve as a natural feed for Artemia in culture ponds. The experiment was conducted in earthen ponds (100 m2 each) and consisted of four treatments (T) with different fertilisation frequencies. T1: applying traditional fertiliser once per week (Trad_1perWeek); T2: applying formula fertiliser once per week (Formula_1perWeek); T3: applying formula fertiliser twice per week (Formula_2perWeek); T4: applying formula fertiliser seven times per week (Formula_Daily). Urea fertiliser (N) and DAP (P) were used as the main fertilisers and the same fertiliser dosage (i.e., a combination of 39.6 g mL-1 urea and 1 mg L-1 DAP per week) was applied for T2, T3 and T4, while T1 applied 3 g mL-1 urea and 1 mg L-1 DAP per week. At day 10, the highest algae density (2.81 x 106 cells mL-1) was obtained in T4 (Formula_Daily) and was significantly different (p < 0.05) compared to the remaining treatments. After T4, the highest algae densities were obtained in T2 (Formula_1perWeek), T3 (Formula_2perWeek) and T1 (Trad_1perWeek) with densities of 1.89 x 106, 1.71 x 106 and 1.56 x 106 cells mL-1, respectively. Therefore, the daily fertilisation for green pond in Artemia culture system is recommended.