Just as extreme hypoxia can be called anoxia, extreme hypoxemia can be called anoxemia. Hypoxia in which there is complete deprivation of oxygen supply is referred to as anoxia. Cells respond by switching to anaerobic metabolism, causing anoxia, lactic acidosis, and eventual cell death. The resulting eutrophication and algae blooms result in anoxia and dead zones. During hibernation, respiration also dramatically decreases, resulting in conditions of relative anoxia in the tissues. This causes death by respiratory failure leading to cerebral anoxia. PSH can also be associated with severe anoxia, subarachnoid and intracerebral hemorrhage, and hydrocephalus. The decrease in neuronal activity renders the turtle comatose for the duration of anoxia. The bay approached sterile conditions at the peak of pollution and algal bloom-induced anoxia. Some species show a remarkable tolerance for hydrogen sulfide and anoxia. Black shales are organic rich, microlaminated sedimentary rocks often associated with bottom water anoxia. He experiences anoxia, resulting in brain damage. Fish trawls can also collect sediment and inform us about ocean-bottom conditions such as anoxia. Pests may be treated with a number of methods, including freezing, insecticide, or anoxia. Anoxia and sulfidic conditions often occur together.