The article highlights the ongoing jelly fishing season at O Loan lagoon in Phu Yen province, Vietnam, which has brought significant income to local fishermen due to high market prices. The jelly, found in both shrimp ponds and the wild, is selling for up to 9,000 VND/kg, resulting in daily earnings of 300,000 VND or more for individuals. Households can earn up to 1-2 million VND daily. The quality jelly is used in various dishes and traditional medicine. However, the mass harvesting of jellyfish poses a risk to the seagrass in the lagoon, which could negatively impact the habitat and breeding environment of aquatic species.