Journal
AQUACULTURE
Volume 286, Issue 3-4, Pages 198-202Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aquaculture.2008.09.025
Keywords
Phosphorus; DGT; Monitoring
Categories
Funding
- Fonds de recherche Sur la nature et les technologies du Quebec
- Societe de recherche et developpement en aquaculture continentale du Quebec
- Developpement Economique Canada
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The high concentrations of phosphorus and suspended matter in freshwater aquaculture are often an environmental concern and given the difficulties for sample preservation, an in situ monitoring tool would be most useful. The diffusive gradients in thin-films (DGT) technique can be used for on site monitoring and also has the advantage to integrate measurements over time and thus partly record ephemeral concentrations peaks. In this study, several DGT deployments were done in fisheries in different geographical areas: Quebec, Canada and Lancashire, UK. The results obtained using the DGT technique were compared with standard measurements. The deployment periods varied from 24 h to 21 d. The results show that the DGT technique can be used to measure reactive phosphorus in freshwater aquaculture up to 4-day deployment periods before biofilm buildup on the DGT device begins to interfere with diffusion and measurements. We obtained good reproducibility in the phosphorus determinations and moreover, this technique integrates daily and hourly variations of phosphorus and the DGT sampler is easy to use and deploy. (C) 2008 Elsevier B.V. All rights reserved.
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