1. General Model Information

Name: Marine salmon cage flushing rates and dissolved oxygen levels

Acronym: FLUSH

Main medium: aquatic
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: not specified
Main application:
Keywords: salmon,cage flushing,Rhodamine,fish farm design,environmentalimpact,parasites,dissoved oxygen,diurnal,tidal signals


Gary L. Bugden
Maritimes Region
Fisheries and Oceans Canada
P.O. Box 1006
Dartmouth, N.S.
Canada B2Y 4A2
Phone: 902 426-2960
Fax : 902 426-7827
email: g_bugden@bionet.bio.ns.ca



Cage flushing times were measured by Rhodamine-WT dye injection in a heavily fouled, 12 m square salmon pen stocked at approximately 4.7 kg/m3. A five port manifold was used both to inject the dye and withdraw water samples for concentration analysis. Exponential decay curves were fitted to dye concentrations after an initial period of about 3 minutes required for the dye to reach a homogeneous distribution within the cage following injection. Eight runs were made under various conditions of incident current. Two of the eight runs had to be discarded as flushing was too rapid for the dye to reach homogeneity, a condition necessary for the exponential fits to be meaningful. Most rapid flushing occurred for currents across the open side of the pen vrs currents running along the length of the multiple pen array. Fitted exponential time constants ranged from about 1 to 7 minutes. Estimates were also made of the mixing within the cage due to various levels of fish activity. The results have application to both farm design and estimation of the environmental impact of parasite treatments. Power spectra of dissolved oxygen time series observations from both within a mariculture site and at a control site were briefly presented. Diurnal and tidal signals were evident.

Authors of the abstract:

Gary Bugden, Paul Keizer and Dave Wildish

II. Technical Information

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Operating System(s):

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III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: 24.June 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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