Blue swimming crab (Portunus pelagicus) is one of the crustaceans which is included in one of the world's fisheries commodities that has high economic value both at home and abroad. Environmental factors and the quality of the waters where the crabs live can affect the growth rate of the crabs. This study aims to examine the chemical quality of oceanography in the natural habitat of swimming crabs in the coastal waters of Pangkep Regency which was carried out from June to July 2023 in the coastal areas of Pangkep Regency. This study uses a descriptive survey method with random sampling. Research shows that water temperature, salinity, pH, Total Dissolved Solids (TDS), phosphate, and nitrate affect crab reproduction in the aquaculture area of ​​Bulumanis Kidul Village. The water temperature range at the study site is 28.9°C to 33.5°C. Salinity ranged from 21.6 - 29.1 ppt, pH between 7.2 - 7.9, TDS between 19.7 - 28 mg/L, phosphate 0.0040 - 0.0289 mg/L, and nitrate 0.003 - 1.597 mg/L.