Fisheries in Bohai Sea occur in an ecosystem, with different provinces conducting fishing activities on different species using different gears. Coordination of government actions continues to be a problem, as there exists many contradictions between different sectoral planning approaches. With the absence of a holistic institutional framework of management mechanism, coastal and marine resources are being destroyed. It has been found out in the study that fisheries resources in Bohai Sea, especially traditional high-valued species such as small yellow croaker, hair tail and Chinese prawn, have been over fished, and they have been replaced by some lowvalued species, mostly primarily smaller pelagic species, such as Japanese anchovy, half-fin anchovy etc. The effects on trophic level changes have been caused by mainly due to impacts from human activities and the variation in natural environmental problem like pollution. The CPUE declined from 2.39 tons/ kilowatt in 1950’s to 0.91 tons / kilowatt in 1990’s. The Bohai Sea being an important spawning, nursery and feeding ground for many migratory species from the Yellow Sea and at the same time supporting an important penaeid shrimp fishery it deemed important to carry out this work. The paper is divided into six sections. The first section is a brief introduction of the physical and biological characteristics of the region. Following is the description of methodology used in this paper. The data used in this study are listed in third section. The next section describes the major fisheries and specie shifts in dominance, and examines of the causes of resource variability are given in section five. Suggestions for restoring the resources of this ecosystem are offered in the final section.