132 BioLink : Jurnal Biologi Lingkungan, Industri dan Kesehatan, Vol. 8 (2) Feb (2022) ISSN: 2356- 458X (print) ISSN: 2597-5269 (online) DOI: 10.31289/biolink.v8i2.5191 BioLink Jurnal Biologi Lingkungan, Industri, Kesehatan Available online http://ojs.uma.ac.id/index.php/biolink BIOECOLOGY OF GIANT FRESHWATER PRAWNS (MACROBRACHIUM ROSENBERGII) IN THE BILAH RIVER, LABUHANBATU DISTRICT, NORTH SUMATERA Siti Aminah Nasution, Rivo Hasper Dimenta* Department of Biology Education, Faculty of Teacher Training and Education, Universitas Labuhan Batu, Indonesia Submited : 04-05-2021; Reviewed :16-06-2021; Accepted : 11-01-2022 *Corresponding author: E-mail : rivohd11@gmail.com Abstract Giant freshwater prawns (Macrobrachium rossenbergii) were still been the favorite prawn catch of local fishermen in the Labuhanbatu district. This raises concerns for the survival of these animals. Therefore, it is necessary to conduct a study to obtain bioecological information on this giant freshwater, giant prawns in the Bilah river especially inform about condition the abundance based on gonad maturity levels, and the growth patterns of Giant freshwater prawns (M. rossenbergii). This study was conducted at 3 stations around the Bilah river. These stations were determined using a purposive sampling method. Furthermore, sampling was carried out using fishing nets. After that, the caught fish were analyzed to find out the Fulton’s condition factor, the abundance of prawns based on gonad maturity levels, and the growth patterns. The results of growth patterns analysis which calculate from the relationship of carapace length and body weight of M. rossenbergii caught were showed negative allometric category (b value 1.88 to 2.577). Meanwhile, the abundance of giant freshwater prawns based on gonad maturity levels for males and females were dominated by immature prawns (ranging from 46.15 to 54.65%). Keywords: Fulton Condition factor; Giant freshwater prawns; Growth patterns; Gonad maturity levels; Macrobrachium rossenbergii How to Cite: Nasution, S.A. & Dimenta, R.H. (2022). Bioecology Of Giant Freshwater Prawns (Macrobrachium Rosenbergii) In The Bilah River, Labuhanbatu District, North Sumatera, BioLink: Jurnal Biologi Lingkungan, Industri dan Kesehatan, Vol. 8 (2): Hal. 132-144