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Tinfoil barb is one of the fish caught in the Tasik river. The purpose of this study was to determine the morphology and weight-length relationship of tinfoil barb. This research was conducted in July-August 2020 in the Tasik river using a net with a mesh size of 1.25 inches. The number of fish caught was 96 fish with a total weight (TW) of 2-47 g and a total length (TL) of 60-125 mm. Meristic characteristics of tinfoil barb consecutively are as follows: 31-33 Linnea Literalis (LL), 24-26 Body Circular Scales (BCS), 12-14 Dorsal Front Scales (DFS), 12-14 Tail Scales (TS) a total of 12 pieces, the dorsal fin formula (DF) is DI. 8-9, the ventral fin formula (VF) is V8-10, the pectoral fin formula (PF) is P12-14, the anal fin formula (AF) is AI. 5-6 and the caudal fin formula is (CF) C14. The results of the length-weight relationship indicate that the growth pattern of fish is negative allometric (b =3.221) where the weight gain is faster than the length gain.

Morphology and weight-length relationship of tinfoil barb (Barbonymus schwanenfeldii) at Tasik River, South Labuhanbatu Regency, Sumatera Utara