Low DO's stress fish and if to low become fatal. Fish under stress do not grow as well as those in optimum surroundings. The question becomes what is the optimum DO range for a fish species. Also keep in mind that DOs effect water quality as well as fish respiration. With better water quality there are less water related non-DO stressors (water quality stressors other than low DO such as high N or ammonia) present and thus the better the conditions for good growth.



Last edited by ewest; 10/20/09 05:04 PM.