it is also a major reason for the practice of fallowing of aquaculture facilities o connor etal as aquaculture moves into offshore and deeper waters oxygen will be a limiting factor in many areas around the globe that seasonally develop severe bottom water hypoxia offshore areas that may be risky places for aquaculture include the northern gulf of mexico off the coasts of mississippi louisiana and texas much of the danish straits the northern adriatic sea the northwest black sea the east china sea off the changjiang river rabalais et al