Length-Weight Relationship and Condition Factor of Two-Spot Catfish (Mystus nigriceps [Valenciennes, 1840]) (Pisces, Bagridae), from Kampar Kanan River and Kampar Kiri River in Indonesia

BACKGROUND AND OBJECTIVE: Mystus nigriceps is a consumption fish species and also preferred as ornamental fish. The existence of this species population in Kampar Kanan and Kampar Kiri river continues to decline due to non-selective fishing. While conservation efforts through domestication are currently not done. The purpose of this study was to analyze the relationship between length and weight and relative condition factors of M. nigriceps on Kampar Kanan and Kampar Kiri river. MATERIALS AND METHODS: A total of 414 fish were collected from both rivers. Fish samples were collected from local fishermen in Kampar Kanan and Kampar Kiri rivers. The fish length measured by using calipers with an accuracy of 0.01 mm and the weight measured with a digital scale with 0.01 g accuracy. RESULTS: The total length of M. nigriceps from Kampar Kanan river ranges from 97.48-160.45 mm and weighs 5.58-59.54 g, while from Kampar Kiri river has a total length ranging from 94.66-198.64 and weight of 6.28-60.44 g. The length and weight relationship of M. negriceps in Kampar Kanan river can be estimated with equation W = 0.0029*L3.393 (R2 = 0.86) with relative condition factor value (Kn) 3.37 and have positive allometric growth pattern. While the length and weight relationship in Kampar Kiri river is W = 0.0034*L3.256 (R2 = 0.91) with relative condition factor value (Kn) 4.62 and also have positive allometric growth. CONCLUSION: This study provides the first baseline data on the relationship between length and weight and relative condition factors of M. nigriceps from Kampar Kanan and Kampar Kiri rivers in Riau Province, Indonesia. The data is very valuable to build a management system and domestication for the fish species.