Pit bull terriers, German shepherds, and Rottweilers were the offending breeds implicated in our study, and have accounted for the majority of dog bites according to other investigators.hese actions range from outright bans on the possession of pit bull-type dogs, to restrictions and conditions on pit bull ownership. They often establish a legal presumption that a pit bull-type dog is prima facie a legally dangerous or vicious dog.
Common causes of oxygen depletion include cloudy weath-. er, sudden death of algae or plants in the pond, and wind. mixing the pond water. Just two to three days of overcast. weather can cause oxygen production to diminish. When. the oxygen demand remains the same or increases, oxygen. levels begin to decrease.
Why Dissolved Oxygen is Important. Dissolved oxygen analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. Oxygen gets into water by diffusion from the surrounding air, by aeration (rapid movement), and as a waste product of photosynthesis.s dissolved oxygen levels in water drop below 5.0 mg/l, aquatic life is put under stress. The lower the concentration, the greater the stress. Oxygen levels that remain below 1-2 mg/l for a few hours can result in large fish kills. 1  Back to Parameters List. 2  Chemical Testing Main Page. 3  Water Watch Home Page.