Effect of density on the growth performance and survival of Asian sea bass fish (Lates calcarifer, Bloch, 1790) In earthen pools Gwadar site

Today, due to the rapid global demand for food, Asian cassava is one of the best farmed fish in the domestic and foreign markets due to its rapid growth and ability to adapt to different environmental conditions. The present study was conducted to investigate the effect of density on growth performance, nutrition and survival percentage of Asian Lates calcarifer in earthen ponds of Gwadar site for 6 months. In this study, storage from April to September 2019 in two different densities: 0.5 fish m-2 or 900 fish in each pond with an area of 1800 m2 and one fish m-2 or 1800 fish with an initial weight of 60 g. It was performed in each pool with the same area with two replications. Physical and chemical factors of water, temperature, oxygen, pH and salinity were examined continuously; bioassay was examined On a monthly basis. Based on the results, at the end of the experiment, the highest daily growth rate (4.8±0.78 g) and average monthly growth (141.5±13.6 g) and the average monthly growth increase (60±7.7%) were observed in the pool with a density of 0.5 fish m-2 (p<0.05). The mean feed conversion ratio and survival percentage of ponds were not significantly different from each other (p>0.05). In total, based on the results of this study, the density of 900 sea bass in an earthen pond with an area of 1800 m2 is recommended in order to improve growth indices.