INTRODUCTION: This study investigates the helminth absence in the invasive blackchin tilapia ( METHODS: We surveyed 164 blackchin tilapia from six different locations in Chumphon Province, Thailand, including the sea, estuary, canal, and shrimp farms, examining them for helminths. Fishermen provided data on the first capture dates in the surveyed areas to determine how long the populations have been established. RESULTS: No helminths were detected in any of the examined fish. The absence of parasites was consistent across all surveyed environments, suggesting a lack of parasitic burden in the population. DISCUSSION: The absence of helminths may contribute to the successful expansion of