|
| Variation of nitrogen，phosphorus and chemical oxygen demand during the cultivation of Ruditapes philippinarum |
| Received:March 30, 2024 |
| View Full Text View/Add Comment Download reader |
| KeyWord:shellfish farming;Ruditapes philippinarum;total nitrogen;total phosphorus;nutrients |
| Author Name | Affiliation | E-mail | | ZHAO Xin | College of Fisheries, Zhejiang Ocean University, Zhoushan 316000, China
State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China | | | CUI Zhengguo | State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China | | | HU Haiyan | College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China | | | JING Yi | College of Fisheries, Zhejiang Ocean University, Zhoushan 316000, China
State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China | | | CUI Hongwu | State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China | | | DING Dongsheng | State Key Laboratory of Mariculture Biobreeding and Sustainable Goods, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China | dingds@ysfri.ac.cn | | GAO Yang | College of Fisheries, Zhejiang Ocean University, Zhoushan 316000, China | gaoyang-82@163.com |
|
| Hits: 383 |
| Download times: 376 |
| Abstract: |
| To find out the variation of nitrogen, phosphorus and chemical oxygen demand（COD）in the Ruditapes philippinarum cultivation. R. philippinarum were cultured in enclosed aquaculture water in the laboratory to simulate open aquaculture water for 30 days, setting three water volumes exchange situation（20%, 50%, 70%）and three specifications of experimental conditions, determinating and analyzing the variation of nitrogen, phosphorus and COD. The concentration of COD, NO3--N and NO2--N increased and NH4+-N showed a decreasing trend with the experimental period increased and the excreta of the organisms accumulated. The average concentration of total nitrogen （TN）under different exchange water conditions was 20% exchange water（1.889 mg·L-1）>50% exchange water（1.144 mg·L-1）>70% exchange water（0.918 mg·L-1）, with an increasing trend in total phosphorus（TP）at 20% exchange water and a decreasing trend at 50% and 70% exchange water. Under different culture specifications, the average rate of decrease of NH4+-N was large specification（84.80%）> medium and small specification（84.10% and 82.02%）; the average concentration of TN was large specification（1.568 mg·L-1）> medium specification（1.301 mg·L-1）>small specification（1.082 mg·L-1）>control group（0.261 mg·L-1）; the average TN concentrations were 26.42% in the large specification, 24.89% in the medium specification, and 21.55% in the small specification, respectively; and the average concentrations of TP were 26.42% in the large specification（0.147 8 mg·L-1）, 24.89% in the medium specification（0.126 0 mg·L-1）, and 21.55% in the small specification（0.098 3 mg·L-1）. The COD values of the experimental group were below than the secondary standard of the sea water quality standards. Under 20% water exchange conditions, R. philippinarum survival was high, nutrient concentrations accumulated more, and the three inorganic nitrogen concentrations changed the most significantly. TP and PO43--P concentrations showed a fluctuating downward trend under 50% and 70% water exchange, the R. philippinarum' consumption of TP andPO43--P is higher than accumulation of TP and PO43--P. With the increase of shell length, the purification effect of clams is large specification > medium specification > small specification, large specification clams have strong water filtration ability and adaptability, medium and small specification are easy to be affected by the environment and the survival rate is lower than that of large specification. |
|
|
|
