the population trends of jellyfish species and revealed a marked increase in the number of invasive jellyfish species in the region of the western Pacific Ocean. Currently, the effects of such complex environmental factors on jellyfish assemblages in the coastal are as of the southern ECS remain unclear. There fore, present study was conducted to collect samples from different environments of the southern ECS to evaluate the effects of monsoons, typhoons, and interplay waters on the diversity and assemblage structure of jellyfish (major classHydrozoa and Scyphozoa) to provide baseline data in northern Taiwan.