Abstract: Based on the analysis of stomach contents of nearshore predator species and on the trawl survey of marine resources covering large area in the Bohai Sea,the composition and distribution of the predator species, and their harm to the enhancement species of fishery resources in the Laizhou Bay of Bohai Sea are studied. The results indicate that the juveniles of perch(Lateolabrax japonicus),Nibea albiflora, Enchelyopus elongatus and Chaeturichys spp.are the main predators of the juveniles of penaeid shrimp and Liza haematochelia, etc.,which are the species of enhancement in Bohai Sea. Predation occurs mainly in nearshore waters. Among the predators, perch is the most important one whose predation takes place mostly in July,and the length of juvenile penaeid shrimp consumed ranges from 3 to 7 cm.Due to the fact that predation on the enhancement species takes place mainly in nearshore and waters where both predator and enhancement species are densely distributed and overlapped, the strategy of avoidance to the predators will be a feasible approach of protecting released juveniles of enhancement species in the selection of enhancement release regions.

Key words: Bohai Sea, Enhancement, Predator fish, Penaeid shrimp, Liza haematochelia, Lateolabrax japonicus, Protection strategy, hydroponics, potassium, accumulation and utilization, tea seedling