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Abstract
This study was conducted to assess the influence of lunar phases on species composition, occurrence frequency, and catch yields of purse seine fisheries using FAD. The study was conducted from September to November 2024 in the Southeastern region of Vietnam. Data were collected from two fishing trips and analyzed according to three lunar phases: the third quarter, the new moon, and the first quarter. The research results show that 7 main pelagic fish species were exploited, with slender scad and little tuna dominating in terms of catch volume. The total catch was 70700 kg, with the highest average catch yield for slender scad being 494.1 kg per batch. The majority of the fish caught were within the marketable length range of 20 ÷ 41 cm. The most abundant species composition in each lunar phase was: little tuna (36% in the third quarter and 30% in the new moon) and slender scad (35% in the first quarter). Little tuna had the highest incidence (100%) in the third quarter and the new moon phases; Slender scad had the highest incidence (100%) in the first quarter phase. The Kruskal-Wallis test results show that lunar phases do not significantly affect the yield of purse seine.
Keywords: Moon phase, purse seine, Southeast region.