a condition of low oxygen concentration, below that considered aerobic.
                                                            
                                                     
                        
                                                
                        
                        
                            A condition where only very low levels of oxygen are present.
                                                            
                                                     
                        
                                                
                        
                        
                        
                                                
                        
                        
                        
                                                
                        
                        
                        
                                                
                        
                        
                            the condition of extraordinarily low oxygen.
                                                            
                                                     
                        
                                                
                        
                        
                            Having too little oxygen.
                                                            
                                                     
                        
                                                
                        
                        
                            Pertaining to, in aquatic environments, conditions in which there is a dissolved-oxygen concentration of less than 3mg per liter* of water; such conditions are usually harmful or deadly to aerobic life.