Biodiversity has many key roles in ecosystems, and many elements of biodiversity support fish species and therefore also fisheries. At the same time, cooperation fisheries also often affect seabed biodiversity.We consider these to be critical elements of the transition into ecosystem-based management.fishery is an entity engaged in raising or harvesting fish which is determined by some authority to be a fishery. According to the FAO, "...a fishery is an activity leading to harvesting of fish. It may involve capture of wild fish or raising of fish through aquaculture." It is typically defined in terms of the "people involved, species or type of fish, area of water or seabed, method of fishing, class of boats, purpose of the activities or a combination of the foregoing features". The definition often includes a combination of fish and fishers in a region, the latter fishing for similar species with similar gear types.[