Biological Parameters of Flowerhorn Cichlid in Panglima Besar Soerdirman Reservoir, Indonesia

Flowerhorn cichlids are potentially invasive fish species because of their wide ranged in trophic level and reproductive properties. This study aims to analyze several biological parameters of flowerhorn cichlids in Panglima Besar Soedirman Reservoirs that consist of many native fishes from Serayu River. Fish were collected from the fisherman that operated using multiple gears and landed the flowerhorn fish in Seakong Fish Market, Wanadadi, Banjarnegara, Indonesia from August to October 2025. Fish were then analyzed in Pescica Marina Laboratory of Fisheries and Marine Science, Universitas Jenderal Soedirman. Biological aspects that were assessed consist of morphology, length-weight relationship (LWRs), relative condition factor (Kn), gonadosomatic index (GSI), length at the first capture (Lc), and maturity (Lm). The results showed that males have a higher condition factor (1.05), although with a negative allometric growth pattern (b