Abstract
The water quality of carp (Nishiki-goi) breeding ponds was investigated. The water quality was summarized as follows: pH 6.5-7.5; hardness 60-135mg·l-1; PO43- and NO3-N less than 10mg·l-1.
An immobilized denitrifying photosynthetic bacterium which was equipped in a circulating filtration system was utilized for the improvement of water quality concerning carp breeding aquariums. Among the immobilization carriers tested, porous ceramic immobilization showed relatively good effects on water quality improvement, such as COD and nitrate removals. For about one month, such effects were maintained and the water quality was kept within the good water quality range for carp breeder ponds.
