Abstract: Leiocassis longirostriswith body weight of(217.86±36.01)g was reared in a net cage of 5.0 m×4.0 m×2.5 m without(as a control group)and with aquatic macrophytePistia stratiotesL.(as a treatment group)at a stocking rate of 45 individuals/m2with tetraplication at water temperature of 24-30℃,pH of 6.5-7.4 and dissolved oxygen level of 5.0 mg/L for 60 days to evaluate the input and recycle of nitrogen,and phosphorus in the cage water.The results showed that the recycle rate of nitrogen was found to be 47.80%in the cage with the aquatic plant and 44.36%in the control cage,without significant difference(P＞0.05).The recycle rate of phosphorus was 35.01%in the cage with the aquatic plant and 32.53%in the control cage,with significant difference(P＜0.05).There were higher utilization efficiencies of nitrogen(26.87%),and phosphorus(15.82%)in the cage with the aquatic plant than those(25.37%for nitrogen,and 15.55%for phosphorus),without significant difference(P＞0.05).A total aquatic plant of 189.5 kg(net weight gain of 154.25 kg)was harvested three times in the cage with the aquatic plant at the end of the experiment,with nitrogen elimination of 257.32 g and phosphorus elimination of 67.08 g.It is estimated that the nitrogen and phosphorus recycle utilization(that is,zero nitrogen and phosphorus effluent)can be obtained when the fish is cultured in a net cage at a ratio of net cage area to the aquatic plant area=1∶32-35.
李猛, 马旭洲, 王武. 大薸对网箱养殖长吻鮠生长及氮、磷排放的影响[J]. 大连海洋大学学报, 2012, 27(5): 402-406.
LI Meng, MA Xu-zhou, WANG Wu. Effects of aquatic macrophyte Pistia stratiotes L.on growth and nitrogen and phosphorus budgets in Leiocassis longirostris reared in net cages. Journal of Dalian Ocean University, 2012, 27(5): 402-406.
2012, Vol. 27 
