Effect of microalgae with semicontinuous harvesting on water quality and zootechnical performance of white shrimp reared in the zero water exchange system

2016 ◽  
Vol 72-73 ◽  
pp. 70-76 ◽  
Author(s):  
Hongxing Ge ◽  
Jian Li ◽  
Zhiqiang Chang ◽  
Ping Chen ◽  
Mingming Shen ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Exchange ◽  
White Shrimp ◽  
Exchange System

Effect of stocking density on soil, water quality and nitrogen budget inPenaeus monodon(Fabricius, 1798) culture under zero water exchange system

2012 ◽  
Vol 44 (10) ◽  
pp. 1578-1588 ◽  
Author(s):  
Ramamoorthy Saraswathy ◽  
Moturi Muralidhar ◽  
Muniyandi Kailasam ◽  
Pitchaiyappan Ravichandran ◽  
Baijnatha Prasad Gupta ◽  
...  
Keyword(s):  
Water Quality ◽  
Soil Water ◽  
Water Exchange ◽  
Stocking Density ◽  
Nitrogen Budget ◽  
Exchange System

scholarly journals Effects of different salinity levels on water quality, growth performance and body composition of Pacific white shrimp (Litopenaeus vannamei Boone, 1931) cultured in a zero water exchange heterotrophic system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammad Hossein Khanjani ◽  
Moslem Sharifinia ◽  
Saeed Hajirezaee
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Body Composition ◽  
Water Exchange ◽  
High Salinity ◽  
Pacific White Shrimp ◽  
Salinity Level ◽  
White Shrimp ◽  
Different Levels ◽  
High Salinity Level

AbstractThe present study was aimed to evaluate the effects of different levels of salinity on water quality, growth performance, survival rate and body composition of Pacific white shrimp in a heterotrophic/biofloc technology (BFT). Shrimp post-larvae with an average weight of 74.46 mg were cultured in 300 L fiberglass tanks containing 130 L water at a density of 1 post-larva/L. Three treatments including different levels of salinity of 8, 21 and 32 ppt with three replicates were considered. The highest levels of body weight, growth rate, specific growth rate, increase in body length and survival rate were observed at high salinity level (32 ppt). The highest feed conversion ratio (FCR) and the lowest level of feed efficiency were obtained in shrimps cultured at lowest salinity level (P<0.05). Biochemical analysis of shrimp body composition showed an increase in protein, lipid and ash content as the salinity elevated (P<0.05). The zero-water exchange system used in this study had no significant effects on water quality parameters. The results of the present study concluded that high salinity level (32 ppt) improves the growth and survival of the biofloc supplemented Pacific white shrimp in a BFT system.

scholarly journals Plankton and water quality variability in an estuary before and after the shrimp farming effluents: possible impacts and regeneration

2017 ◽  
Vol 65 (3) ◽  
pp. 495-508
Author(s):  
William Bauer ◽  
Paulo Cesar Abreu ◽  
Luis Henrique Poersch
Keyword(s):  
Water Quality ◽  
Quality Parameters ◽  
Pacific White Shrimp ◽  
Shrimp Farming ◽  
Water Quality Parameters ◽  
White Shrimp ◽  
Zooplankton Abundance ◽  
Patos Lagoon ◽  
Short Period ◽  
Before And After

Abstract Water quality, chlorophyll a, phytoplankton, proto and mezo-zooplankton abundance were spatiotemporally evaluated in an estuary receiving effluents from a Pacific white shrimp Litopenaeus vannamei farm in Patos Lagoon estuary, Southern Brazil. Samples were taken before (BD) and; 1 day (1 PD) 5 days (5 PD), 10 days (10 PD), 20 days (20 PD) and 30 days (30 PD) after the effluents discharge. Some water quality parameters were affected by the effluents discharge; however, these changes were restricted to a distance of 20 m from the effluent discharge channel for a period of 5 days. The microbial community was dominated by chlorophyceae, followed by diatoms, cyanobacteria and ciliates. There was an increase in the abundance of different groups on the 1 PD sampling compared to BD. The zooplankton abundance was low in practically all sites, except for 30 PD sampling. The meso-zooplanktonic organisms were represented by copepods, mostly Acartia tonsa. Despite some effects on water quality and phytoplankton and protozooplankton abundance until 5 PD sampling, these alterations dissipated in a short period of time. We conclude that the environment quickly assimilated the effluents discharge, and the water quality parameters remained within the limits stipulated by standard guidelines.

scholarly journals Study on Water Exchange and Water Quality Simulation of Macao Airport Expansion Project

2021 ◽  
Vol 261 ◽  
pp. 03019
Author(s):  
Huang Pengfei ◽  
Liu Pei ◽  
Xu Wei
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Exchange Rate ◽  
Water Exchange ◽  
Exchange Capacity ◽  
Two Dimensional ◽  
Water Exchange Rate ◽  
Water Quality Simulation ◽  
Significant Difference ◽  
Better Than

In this paper, we analyzed the current situation of water pollution sources near Macao airport, established a two-dimensional water exchange and water quality mathematical model near the project, and compared and simulated the reclamation schemes of Macao airport. According to the results of water exchange and COD calculation of water quality, the 80 m channel scheme was remarkably better than the 40 m one in terms of water exchange capacity and the possibility of achieving the water quality target. However, with the increase of channel width, the variation of water exchange rate and half exchange period would slow down. There was no significant difference in water exchange rate, water exchange period and water quality distribution between 80m channel and 120 m channel. The final scheme was to adopt the 80 m channel.

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