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Estimating aquatic phosphorus concentrations 30 metres down-current from a rainbow trout cage array.

Gregor K Reid1, Richard D Moccia

  • 1Department of Fisheries and Oceans Canada, St. Andrews Biological Station 531 Brandy Cove Road, St. Andrews, New Brunswick, E5B 2L9, Canada. gregor@uoguelph.ca

Journal of Environmental Monitoring : JEM
|August 3, 2007
PubMed
Summary

This study models total phosphorus (Tot-P) near rainbow trout farms. The findings show that Tot-P concentrations down-current from fish cages can be accurately predicted using farm activity data.

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Area of Science:

  • Aquatic science
  • Environmental modeling
  • Fisheries management

Background:

  • Aquatic total phosphorus (Tot-P) monitoring is crucial for regulatory compliance near rainbow trout (Oncorhynchus mykiss) aquaculture.
  • Predicting near-field Tot-P concentrations is essential for effective management and farming operations, especially if reference sites are compromised.

Purpose of the Study:

  • To develop a model for estimating down-current Tot-P concentrations from rainbow trout cages.
  • To assess the relationship between farm production and near-field Tot-P levels.

Main Methods:

  • A nutritional mass balance approach was employed to calculate non-settleable Tot-P.
  • Non-settleable Tot-P was divided by the flushing volume over four production periods.
  • Modelled estimates were compared against empirical results for accuracy and precision.

Main Results:

  • The developed model demonstrated good accuracy (slope = 1.06) and precision (r(2) = 0.75) in predicting Tot-P concentrations.
  • Modelled estimates aligned well with empirical data despite various uncertainties.
  • It was concluded that Tot-P concentrations 30 m down-current from cages could be reliably modelled.

Conclusions:

  • Near-field Tot-P concentrations are significantly influenced by aquaculture activities.
  • The model provides a valuable tool for managers and farmers to understand and predict phosphorus levels.
  • This research supports sustainable aquaculture practices through improved environmental monitoring and management strategies.