Reveal The Growth Pattern and Condition Factors of Blue Swimming Crabs (Portunus pelagicus) in Estuary Ecosystem of Berombang, Labuhanbatu Regency, North Sumatera

The Blue swimming crab Portunus pelagicus which comes from subphylum Crustacea, specifically the Portunidae family, is one of potential crabs that have high economic value in Labuhanbatu regency. This study aimed to reveal information on condition factors and population growth pattern P. ecosystem Berombang river estuary. was conducted November 2021 January 2022, using purposive random sample method determining sampling points. In collecting samples pelagicus, researchers used fish traps called bubu with fresh as bait. Results showed negatively allometric, values ​​for males females were 1.1552 2.2727, respectively. Furthermore, results correlation analysis between physical-chemical waters abundance indicated positive for water temperature (0.835), dissolved oxygen (DO) (0.778), salinity (0.726) had an effect presence pelagicus.