The study was conducted to determine the optimal salinity and density for biomass culture of the copepod Apocyclops dengizicus to be used as initial feed for marine fish and crustacean larvae. Two experiments were implemented and designed in a 1 L beaker system under room temperature with continuous aeration. In the first experiment, copepod population was evaluated at different salinities including 10‰, 15‰, 20‰, 25‰ and 30‰. Initial stocking density was 1000 ind.L^-1. Copepods were fed with mixture of 3 different algae including  Chaetoceros calcitrans, Isochrysis galbana và Dunaliella tertiolecta with a ratio of 1:1:1 at 500,000 cells.mL^-1. In the second experiment, different stocking densities were investigated including 500 ind.L^-1, 1000 ind.L^-1, 2000 ind.L^-1 and 3000 ind.L^-1. The results showed that the best population growth of A. dengizicus was obtained in 20‰ and 30‰ which were significantly different to 10‰ and 15‰ (p-1 with 14,567±3,211ind.L^-1 compared to 13.200±2.008, 12.100±1.108 and 11.733±1.078 ind.L^-1  in treatments of 2000 ind.L^-1, 3000 ind.L^-1 and 500 ind.L^-1, respectively.