title: Effects of portable solar water quality control machines on aquaculture ponds.
abstract: The effects of a portable solar water quality control machine (PSWM) on water quality and sediment of aquaculture ponds were studied in bream aquaculture ponds in Shanghai, China. PSWM operation reduced the temperature and dissolved oxygen (DO) differences between upper and lower water levels. Concentrations of NH4+-N, NO2--N, TN, TP, COD and TSS increased rapidly and reached maximums at 12 h. The density and biomass of phytoplankton and levels of chlorophyll a reached maximums after 40 h of PSWM operation. In a 165-day study, the mean concentrations of NH4+-N, NO2--N and the available phosphorous (AP) in the PSWM ponds were significantly lower than in the control ponds, but the TP was significantly greater than the control ponds. Compared with the test began, the thickness of the sediment in PSWM ponds declined by 12.4 ± 4.3 cm, the control ponds increased by 5.0 ± 2.3 cm and the TN and AP levels in sediment significantly declined. PSWM treatment increased the production of bream and silver carp by 30 and 25%, respectively, and the feed coefficient was reduced by 24.2%. Use of PSWM in bream aquaculture ponds improved water quality, reduced sediment, reduced aquaculture pollution emissions and increased production.
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China. liuxg1223@163.com.|Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China. liuxg1223@163.com.
authors.forename: Xingguo
authors.initials: X
authors.lastname: Liu
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China.|Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China.|Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Cheng
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China.
authors.forename: Chong
authors.initials: C
authors.lastname: Liu
authors.affiliation: Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Shijing
authors.initials: S
authors.lastname: Liu
authors.affiliation: Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Shimin
authors.initials: S
authors.lastname: Lu
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China.|Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Changfeng
authors.initials: C
authors.lastname: Tian
authors.affiliation: Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Rong
authors.initials: R
authors.lastname: Tang
authors.affiliation: Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, No. 63 Chifeng Road, Yangpu District, Shanghai, 200092, China.|Key Laboratory of Fishery Equipment and Engineering, Ministry of Agriculture, Shanghai, 200092, China.
authors.forename: Zhaojun
authors.initials: Z
authors.lastname: Gu
mesh_terms: D000818:Animals; D017756:Aquaculture; D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D003530:Cyprinidae; D005618:Fresh Water / Q000737:chemistry; D010758:Phosphorus / Q000032:analysis; D010839:Phytoplankton / Q000737:chemistry; D061005:Ponds / Q000032:analysis*; D011786:Quality Control; D060753:Water Quality
chemical_list: D002734:Chlorophyll; D010758:Phosphorus; D000077194:Chlorophyll A
keywords: Pond aquaculture; Sediment; Solar portable control machine; Water quality