Empirical relationships describing benthic impacts of salmon aquaculture
By B. Hargrave. 2010
104 citations recorded by the source corpus.
Benthic organic enrichment due to sedimentation of waste feed and fecal matter released from salmon and other marine finfish aquaculture facilities has traditionally been measured by observing changes in benthic macrofauna assemblages. Sediment oxygen consumption, dissolved nutrient fluxes and variables such as redox potentials (normalized to hydrogen potential, EhNHE) and dissolved 'free' sulfides (Σ S 2- , HS - , H2S) (S) are also sensitive chemical indicators of benthic enrich- ment effects. Hypoxic or anoxic sediments are formed when high rates of organic matter (OM) sedi- mentation stimulate anaerobic metabolic processes such as sulfate reduction. General changes in EhNHE, S, OM flux and indices of macrofauna diversity in sediments as a result of increased organic enrichment around salmon aquaculture sites have been described in numerous studies. Some of the results are summarized here in empirical regressions that relate changes in sediment chemical and benthic biological variables to increased OM supply. The equations are descriptive of the data for salmon aquaculture sites where the studies were performed and further investigations are required to determine if the relationships provide general quantitative expressions for changes in sediment geochemical conditions and macrofauna community structure due to benthic organic enrichment.
Subfields: Global and Planetary Change, Oceanography
View Paper: https://www.semanticscholar.org/paper/52b710bc7e220492f06c175baeb994fa2fe7932e
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In Global and Planetary Change
In Oceanography
- P. Cranford
- S. Robinson
- J. Ferreira
- Myriam D. Callier
- C. McKindsey
- C. M. Pearce
- F. O’Beirn
- Ø. Strand
Citations in the corpus
- Attraction and repulsion of mobile wild organisms to finfish and shellfish aquaculture: a review (2018, background): “Numerous studies (e.g. Karakassis et al 2000, Buschmann et al 2006, Kutti et al 2008, Hargrave 2010) have evaluated the impact of fish and shellfish farming on wild populations but most of these have focused on sessile organisms or those with low mobility, particularly infauna.”
- Role of deposit feeders in integrated multi-trophic aquaculture — A model analysis (2016, background): “Under natural conditions, practically all the organic load to the sediment is processed by deposit feeders and the net organic enrichment is 4 g Particulate Organic Carbon (POC) m y, well below the threshold proposed by Hargrave et al. (1997).”