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Issue 8, 2007
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Estimating aquatic phosphorus concentrations 30 metres down-current from a rainbow trout cage array

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Abstract

Aquatic total phosphorus (Tot-P) is measured 30 m distant from rainbow trout (Oncorhynchus mykiss) cages, for regulatory compliance on the Canadian side of Lake Huron. The ability to predict changes in near-field Tot-P concentrations from changes in production, or to explain near-field concentrations in the event of compromised reference sites, would be very useful for managers and farmers. A logical first step in the development of a near-field model is the estimation of down-current Tot-P concentrations. A nutritional mass balance approach was used to calculate the amount of non-settleable Tot-P which was divided by the corresponding flushing volume over four separate production periods. Despite a number of uncertainties, such as cage effects on flushing volume, the contribution of particulate phosphorus, fish distribution, feed conversion ratio, and ingestion–excretion time; accuracy (slope = 1.06) and precision (r2 = 0.75) of modelled estimates fit well with empirical results. It was concluded that 30 m down-current Tot-P concentrations could be modelled under a diverse set of culture and environmental conditions, suggesting typical ‘near-field’ concentrations of Tot-P can be explained on the basis of farm activities.

Graphical abstract: Estimating aquatic phosphorus concentrations 30 metres down-current from a rainbow trout cage array

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Article information


Submitted
09 Mar 2007
Accepted
16 May 2007
First published
11 Jun 2007

J. Environ. Monit., 2007,9, 814-821
Article type
Paper

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

G. K. Reid and R. D. Moccia, J. Environ. Monit., 2007, 9, 814
DOI: 10.1039/B703585C

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