1227 Received: 30-08-2023 Accepted: 10-10-2023 Int. j. adv. multidisc. res. stud. 2023; 3(5):1227-1231 Length-Weight Relationship and Condition factor of Notopterus Notopterus (Pallas, 1769) from East Pedamaran Floodplain, Ogan Komering Ilir, South Sumatra, Indonesia Muslim Muslim Department of Fisheries, Faculty of Agriculture, Aquaculture Study Program, Universitas Sriwijaya, Indralaya, Indonesia Corresponding Author: Muslim Muslim Abstract The study of length-weight relationships and condition factors is a fundamental component of fisheries management. Notopterus notopterus (Pallas, 1769) is a fish species native to Indonesia. They are utilized as a side dish, in the culinary and snack industries, and as ornamental fish. This study aimed to analyze the length-weight relationship and condition factors of N. notopterus from the East Pedamaran Floodplain, Ogan Komering Ilir, South Sumatra, Indonesia. A total of 108 N. notopterus samples were used in this study. The results showed that the length-weight relationship of N. notopterus was negatively allometric, with the regression equation W = 0.0948.L 2.2012 (R 2 =0.5332). The condition factor value was 1.02, indicating that the N. notopterus population was in good condition. The data from this study are very useful for the sustainable management of N. notopterus in the future. Keywords: Fish Resource, Marsh, Knifefish, Native Species, Swamp Introduction The length-weight relationships (LWRs) are important and fundamental components of fisheries management tools (Kumari et al., 2019) [11] . It is highly crucial for several biological aspects of the species (Freitas et al., 2017) [6] , ecological assessments and monitoring (Orlov & Binohlan, 2019) [24] , the life history of fishes (Ferdaushy & Alam, 2015) [5] , population stock assessment studies (Augustina et al., 2022) [2] , understanding maturity and reproduction (Soni & Ujjania, 2017) [29] , growth and body condition (Zuchi et al., 2020) [32] , and geographic and seasonal (Lima et al., 2021) [13] . The LWRs are an important tool in aquaculture management as they provide information on survival, mortality, growth, and total production (Kaur & Rawal, 2017) [9] . The condition factor provides information on the physiological condition of the fish in terms of its well-being (Ighwela et al., 2011) [8] , overweight status (Ouahb et al., 2021) [25] , gonadal development, and maturity status (Pathak et al., 2022) [26] . It is an index reflecting interactions between biotic and abiotic factors in the physiological processes of fish (Lizama & Ambrosio, 2002) [14] . The bronze featherback, or Asian knifefish, Notopterus notopterus (Pallas, 1769), is a species of fish native to Southeastern Asia. Its natural habitats are located in Pakistan, India, Bangladesh, Thailand, Myanmar, Malaysia, Laos, the Philippines, Cambodia, Vietnam, and Indonesia (Achakzai et al., 2015; Kyaw et al., 2020; Mohanty & Samanta, 2016; Mustafa et al., 2014; Naeem et al., 2010; Winn et al., 2021) [1, 12, 15, 22, 23, 31] . In Indonesia, it has been documented in South Sumatra, Bangka Island, Jambi, Riau, Riau Island, and Kalimantan (Mulyani & Budijono, 2014; Muslim & Syaifudin, 2022; Rapita et al., 2021; Wibowo et al., 2009) [17, 19, 28, 30] . The species is reported to inhabit rivers, floodplains, reservoirs, and lakes (Achakzai et al., 2015; Mulyani & Budijono, 2014; Muslim & Syaifudin, 2022; Naeem et al., 2010; Rapita et al., 2021) [1, 17, 19, 23, 28] . It feeds on fish, crustaceans, insects, microalgae, nematodes, annelids, macrophytes, detritus, and some young roots of aquatic plants (Achakzai et al., 2015; Rapita et al., 2021) [1, 28] . This fish can easily adjust to the conditions of cultivation. As a result, it may one day become a commodity for aquaculture (Muslim et al., 2020) [18] . This species is adaptable in aquariums, box containers, and buckets (Muslim et al., 2023; Muslim & Simanjuntak, 2023) [21, 20] . The present study was designed to explore length- frequency distributions, length-weight relationships, and condition factors of N. notopterus in the East Pedamaran Floodplain, Ogan Komering Ilir, South Sumatra. Findings from the present study will significantly contribute to the successful management of N. notopterus to preserve it from possible depletion in the wild. Materials and Methods This research was conducted in the Floodplain area of Kayu Labu Village, East Pedamaran Sub-district, Ogan Komering Ilir District, South Sumatra, Indonesia (Fig 1). East Pedamaran Sub-district is one of subdistricts in Ogan Komering IlirRegency which distance about 72 km to capital of regency. It is located in south east capital of regency. East Pedamaran Sub-district has 10 meters from surface of sea level, and total area is 671.11 km².