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| Particle Size Distribution of Suspended Solids in Cultured Tailwater of Pacific White Shrimp Litopenaeus vannamei |
| LIU Jinjin, ZHANG Lingling, ZHANG Yuping |
| Shanghai Fisheries Research Institute, Shanghai Fisheries Technical Extension Station, Shanghai 200433, China |
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Abstract To understand the matter composition and particle size distribution characteristics of suspended solid in aquaculture tail water, the total suspended solid, nitrogen and phosphorus composition and particle size distribution were analyzed in the drainage process of tailwater from three typical Pacific white shrimp Litopenaeus vannamei culture ponds in Shanghai region in November 2021. Results showed that mass concentrations of total suspended solids, particulate nitrogen and particulate phosphorus in the tail water were all shown to be an increasing trend with the depth of drainage, with the increment in the late stage of drainage. Then, the proportion of particulate nitrogen and phosphorus in suspended matter showed decreasing trend, from 6.11% and 1.20% before drainage to 0.38% and 0.11% at the end of drainage, respectively. Size distribution of suspended particles was driven by the drainage process. At the end of drainage, the median diameter of suspended particle was 11.69 μm in SP1, 20.89 μm in SP2, and 38.23 μm in SP3. Suspended matter was mainly composed of collidal and fine particles with diameter lower than 100 μm, with the average volume coverage of 92.68%. The particle size numeric distribution in shrimp cultured tailwater was described by variable β model (r2=0.849±0.128), and the volumetric distribution was fitted to lognormal distribution model (r2=0.879±0.141).
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Received: 30 September 2022
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