Abstract
AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 8:575-584 (2016) - DOI: https://doi.org/10.3354/aei00199 Erodibility of aquaculture waste from different bottom substrates B. A. Law1,2,*, P. S. Hill2, T. G. Milligan1, V. Zions1 1Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia B2Y 4A2, Canada 2Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, B3H 4J1, Canada *Corresponding author: brent.law@mar.dfo-mpo.gc.ca ABSTRACT: A laboratory study was carried out to examine the effect of bed sediment texture on the erodibility of salmon aquaculture waste fecal material and salmon feed pellets. Erodibility measurements of this material were made using a Gust microcosm erosion chamber and artificially composed substrates of mud, sand, sand and gravel, sand and cobble, and cobble. Results show that cumulative mass eroded (CME) and erodibility constant (M) can vary by up to an order of magnitude depending on substrate composition, with a mud substrate having higher CME and M values than those of substrates composed of sand, gravel and cobble. Findings from this study suggest that bottom sediment texture plays a major role in aquaculture waste resuspension and subsequent transport and that predictive models of the transport of aquaculture waste should include the erosion dynamics of bottom texture. KEY WORDS: Aquaculture · Erodibility · Waste transport · Bottom substrate Full text in pdf format Supplementary material PreviousCite this article as: Law BA, Hill PS, Milligan TG, Zions V (2016) Erodibility of aquaculture waste from different bottom substrates. Aquacult Environ Interact 8:575-584. https://doi.org/10.3354/aei00199 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 8. Online publication date: October 17, 2016 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2016 Inter-Research.
Highlights
With the expansion of the aquaculture industry, concerns have been raised over the fate of aquaculture waste material — primarily feed pellets and fecal matter — from salmon farming
Models presently being used for finfish aquaculture do not predict waste transport accurately because there is a lack of data with which to parameterize the cohesive nature and transport properties of fecal material, waste pellets, and their interaction with particulate matter in suspension and on the seabed
Bottom sediment substrate plays a role in the erodibility of aquaculture waste material
Summary
With the expansion of the aquaculture industry, concerns have been raised over the fate of aquaculture waste material — primarily feed pellets and fecal matter — from salmon farming. Models that predict the transport and fate of particles in the coastal ocean are required by habitat managers, fisheries and aquaculture managers, and other government regulators, to understand marine water quality, contaminant transport, coastal erosion, and the cumulative effects from anthropogenic influences. Models presently being used for finfish aquaculture do not predict waste transport accurately because there is a lack of data with which to parameterize the cohesive nature and transport properties of fecal material, waste pellets, and their interaction with particulate matter in suspension and on the seabed. To examine the effect of bottom type on erosion, aquaculture wastes were placed on top of sediment cores that contained different substrates. Results are presented in terms of the erodibility parameter, M, and the critical erosion stress (i.e. τcrit) required to mobilize waste particles
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