Northernmost Record of Invasive Jaguar Cichlid ( <scp> <i>Parachromis managuensis</i> </scp> ) in East Asia: Ecological Implications for Native Species in Feitsui Reservoir, Taiwan

ABSTRACT The jaguar cichlid ( Parachromis managuensis ), an invasive species native to Central America, was first recorded in Feitsui Reservoir, Taiwan, in 2014. From 2014 to 2024, 846 individuals were captured, with abundance increasing notably from 2018. Stomach content analysis revealed predation on native crustaceans ( Caridina , Macrobrachium ) and native fish ( Sinibrama macrops ), suggesting potential ecological impacts. Growth analysis indicated negative allometric growth and signs of growth retardation in larger individuals. The decline of S. macrops may be linked to increasing predation. This study marks the northernmost record of this species in East Asia and raises concerns about its ecological impact.