Abstract:Jellyfish bloom has had numerous deleterious effects in the marine ecosystem worldwide in past decades. In particular, jellyfish bloom impedes the recovery of fish stocks by preying on fish eggs and larvae, and competing strongly for food with fish. Recently, studies have focused on the predatory relationship between fish and jellyfish. However, the species involved vary among different jellyfish-bloom areas. are, the three common jellyfish species along Chinese coastal seas, of which is a cosmopolitan jellyfish species, and the other two species were indigenous. To the best of our knowledge, the predatory ability of different jellyfish species has not been estimated, as well as the predation of jellyfish on larger fish larvae (more than 10 mm). In this study, the predation of three common jellyfish species (), as 4-cm medusae, in Chinese coastal seas on fish larvae of , was studied using the clearance method. All three jellyfish species could prey on fish larvae, and their predatory abilities decreased as the fish grew. The ranges of were not bigger than 15 mm and 20 mm, respectively; the ranges of were not bigger than 20 mm and 30 mm, respectively; and the ranges of were not bigger 30 mm (the experiment of was not done). Clearance rates were similar between the different prey concentrations, and metamorphosis of helped to avoid predation. The clearance rates of different jellyfish species mainly depended on their vitality, though body structure and toxicity of jellyfish were also important factors. Accordingly, had the highest vitality and predatory ability toward fish larvae, followed by . The results provide theoretical evidence of the relationship between fish and jellyfish, and will further the study of the recruitment mechanisms of natural fish resources in Chinese seas.