for example the current spawning stock biomass of southern bluefin tuna is only of the unfished level single species management only focuses on sustainability ignoring habitat quality biodiversity and socioeconomic factors ecosystembased fisheries management has been a common theme in fishery policy and management discussions worldwide nmfs fao garcia et al the north pacific marine science organization pices has addressed this issue and established a working group in that focuses on ecosystembased management science and its application in north pacific countries