Hydrodynamic effect of a large offshore mussel suspended aquaculture farm

Lin, Jun; Li, Chunyan; Zhang, Shouyu

doi:10.1016/j.aquaculture.2015.08.039

Cited by 49 publications

(66 citation statements)

References 39 publications

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“…Reduced hydrodynamic flows are known to lead to reduced turbulence, which in turn tends to promote the blooming of dinoflagellate species, including HAB species (Smayda & Reynolds 2001). Mariculture structures, including longlines for shellfish and kelp and net pens for finfish can significantly change surface current speed and direction, induce down-welling, increase stratification and reduce water exchange in sheltered and enclosed bays (Zeng et al 2015;Lin et al 2016;Wartenberg et al 2017). Expansion of suspended mariculture in Sanggou Bay reduced the average speed of currents by 40% and the average half-life of water exchange was prolonged by~70% (Shi & Wei 2009).…”

Section: Physical Alteration Of Habitats and Hydrodynamic Regimesmentioning

confidence: 99%

Assessing risks and mitigating impacts of harmful algal blooms on mariculture and marine fisheries

Brown

Lilley

Shutler

et al. 2019

Reviews in Aquaculture

117

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Aquaculture is the fastest growing food sector globally and protein provisioning from aquaculture now exceeds that from wild capture fisheries. There is clear potential for the further expansion of marine aquaculture (mariculture), but there are associated risks. Some naturally occurring algae can proliferate under certain environmental conditions, causing deoxygenation of seawater, or releasing toxic compounds (phycotoxins), which can harm wild and cultured finfish and shellfish, and also human consumers. The impacts of these so-called harmful algal blooms (HABs) amount to approximately 8 $billion/yr globally, due to mass mortalities in finfish, harvesting bans preventing the sale of shellfish that have accumulated unsafe levels of HAB phycotoxins and unavoided human health costs. Here, we provide a critical review and analysis of HAB impacts on mariculture (and wild capture fisheries) and recommend research to identify ways to minimise their impacts to the industry. We examine causal factors for HAB development in inshore versus offshore locations and consider how mariculture itself, in its various forms, may exacerbate or mitigate HAB risk. From a management perspective, there is considerable scope for strategic siting of offshore mariculture and holistic Environmental Approaches for Aquaculture, such as offsetting nutrient outputs from finfish farming, via the co-location of extractive shellfish and macroalgae. Such pre-emptive, ecosystem-based approaches are preferable to reactive physical, chemical or microbiological control measures aiming to remove or neutralise HABs and their phycotxins. To facilitate mariculture expansion and long-term sustainability, it is also essential to evaluate HAB risk in conjunction with climate change.

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Section: Physical Alteration Of Habitats and Hydrodynamic Regimesmentioning

confidence: 99%

Assessing risks and mitigating impacts of harmful algal blooms on mariculture and marine fisheries

Brown

Lilley

Shutler

et al. 2019

Reviews in Aquaculture

117

View full text Add to dashboard Cite

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“…Several observations have demonstrated that velocity reduction attributed to shellfish farming structures often ranges between 25 and 75%, but can reach 90% in extreme cases (Cayocca ; Plew ; Lin et al . ).…”

Section: Shellfish Farming As a Driver Of The ‘Hydrodynamic’ Environmmentioning

confidence: 97%

“…For example, Lin et al . () reported a drastic decrease (up to 80%) in surface Chl ‐a concentration inside a mussel raft area compared with the outside zone at Gouqi Island (China). In a mussel farm from Ria de Vigo (Spain), Petersen et al .…”

Section: Grazing Pressure Induced By Shellfish Farming: a Source Of Pmentioning

confidence: 99%

Shellfish culture: a complex driver of planktonic communities

Hulot

Saulnier

Lafabrie

et al. 2018

Reviews in Aquaculture

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This review features recent updates on planktonic community alteration attributed to shellfish farming across three major drivers: predation, nutrient availability and the hydrodynamic environment. The grazing pressure generated by filter‐feeder communities (shellfish and epibionts) constitutes a ‘top‐down’ control of planktonic communities in aquaculture areas, inducing a significant depletion of planktonic organism concentration. By selecting larger cells during the filtration process, shellfish also favour smaller organisms in the water column, leading to the dominance of the latter. Direct excretion and the benthic alteration process tend to fertilise the water column and significantly stimulate primary production. The associated epibiont community particularly contributes to this regeneration process. The expected consequence of increasing nutrient availability is generally a planktonic shift in favour of small planktonic species. However, investigation on the relationship between planktonic structure and nutrient conditions has revealed a wide complexity and variability. Finally, all structures used in shellfish farming activities interact with water currents and tend to significantly increase the residence time of planktonic organisms inside shellfish farming areas. In grazing‐dominated systems, an increase in residence time tends to increase the exposure time of planktonic populations to detrimental conditions, reducing biomass and production. The general consequences of shellfish farming are a decrease in primary production in farming ecosystems, and a possible alteration of structure and functioning of planktonic communities. The implications of shellfish farming also appear to be quite different from other aquaculture activities such as fish farming, which tend to promote primary production leading to eutrophication process.

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“…C ds is derived by fitting the vertical profiles of tidal current observed in April 2011; it is in the range 1.5×10 −4 -2.5×10 −1 . Such an approach has been commonly used in previous studies (Fan et al 2009, Shi et al 2011, Lin et al 2016. A parameterization of the drag per plant, as proposed by Jackson and Winant (1983), was used in the form…”

Section: Model Configurationsmentioning

confidence: 99%

Aquaculture-induced boundary circulation and its impact on coastal frontal circulation

Xuan

Zhou

et al. 2019

Environ. Res. Commun.

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With the development of coastal suspended aquaculture industry, aquaculture facilities have extended into the open sea to depths of up to 30 m. This practice will likely affect the natural ocean circulation in such areas. For a case study in the high-density aquaculture region of the coastal Yellow Sea, an aquaculture-induced boundary circulation (ABC) is identified and its effects on the background frontal circulation and cross-shore nutrient supply are examined. The ABC is composed of a southward along-boundary current and a counterclockwise cross-boundary cell. The southward along-boundary current (∼5 cm s −1 ) along with the natural frontal current (∼5 cm s −1 ) forms a strong coastal current (∼10 cm s −1 ) along 20-30 m isobaths. The counterclockwise cross-boundary cell exhibits the opposite direction to the natural clockwise cross-frontal cell in the frontal area, which reduces the cross-shore nutrient supply by nearly 25%. Our results suggest that aquaculture boundaries and densities should be considered when planning high-density aquaculture activities.

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Hydrodynamic effect of a large offshore mussel suspended aquaculture farm

Cited by 49 publications

References 39 publications

Assessing risks and mitigating impacts of harmful algal blooms on mariculture and marine fisheries

Assessing risks and mitigating impacts of harmful algal blooms on mariculture and marine fisheries

Shellfish culture: a complex driver of planktonic communities

Aquaculture-induced boundary circulation and its impact on coastal frontal circulation

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