The Depleted Carbon Isotopic Signature of Nematodes and Harpacticoids and Their Place in Carbon Processing in Fish Farm Sediments

Grego, Mateja; Malej, Alenka; Troch, Marleen De

doi:10.3389/fmars.2020.00572

Cited by 5 publications

(3 citation statements)

References 77 publications

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“…Increased deposition of organic matter on the seabed below fish cages (Kovac et al 2003, Lojen et al 2005 has been confirmed for our study area and negatively affects the sediment chemical properties and the abundance and structure of meiofauna (Grego et al 2009(Grego et al , 2020. The impact of aquaculture on microbes have been studied mainly in sediments, much less in the water column.…”

Section: Introductionsupporting

confidence: 74%

“…Uneaten food and faeces lead to the accumulation of a large amount of organic matter on the seabed below the cages in our study area (Lojen et al 2005) since the sedimentation rates in the vicinity of the fish cages were significantly higher (eight times higher) than background values for Piran Bay (Kovac et al 2003). Accumulation of organic and inorganic nutrients showed significant changes in redox potential and concentrations of chlorophyll a and phaeopigments in the sediment (Štrukelj 2008), as well as structure and abundance of meiofauna (Grego et al 2009(Grego et al , 2020. The negative influence of fish farm on the phytoplankton and bacterioplankton in immediate proximity was confirmed with in situ experiment with incubation in dialysis bags (Štrukelj 2008).…”

Section: Discussionmentioning

confidence: 77%

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Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Turk,

Tinta

2021

ABS

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A multidisciplinary approach was used to study the impact of fish farming on coastal bacterial communities in the inner part of the Bay of Piran (northern Adriatic). Differences in bacterial abundance, production and the occurrence of selected bacterial groups were studied in the water column around the cage and at different distances from the centre of the fish cage towards the open water, i.e., reference marine station. We also examined the effect of fish feeding on the surrounding system in a short-term in situ experiment based on the simultaneous collection of seawater samples from different locations around the fish cage before and after feeding of fish. Our study suggests that fish feeding has a moderate short-term effect on water column parameters, including bacterial abundance and production, only at a limited distance from the fish cages. The nitrifying, ammonia-oxidizing bacterial groups, as determined by the fluorescent in situ hybridization method, were represented at a higher percentage in the seawater samples in the middle and around the fish cages. β- Proteobacteria, γ-Proteobacteria and the Cytophaga-Flavobacterium group were represented to a higher percentage at sampling sites in the middle of the Bay of Piran and at the reference marine station. The Vibrio group was detected at all sampling sites. The accumulation of organically enriched fish food and waste products releasedinto the seawater during the short-term experiment resulted in a significant increase in particulate matter, orthophosphate and ammonium. In response to the increase in inorganic nutrients, we observed a significant increase in bacterial production, whileno significant differences were observed in bacterial abundance in such short time.

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Section: Introductionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 77%

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Turk,

Tinta

2021

ABS

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“…Other common methods used to track aquaculture wastes in marine systems and with potential application on benthic sessile taxa include fatty acids (FAs) and stable isotopes (SIs) turnovers. Aquaculture feeds are mostly made of terrestrial plants and consequently, typically contain high levels of terrestrial fatty acids (FAs) such as oleic acid 18:1 (n-9), linoleic acid 18:2 (n-6) and a-linolenic acid 18:3 (n-3)), and display a stable isotope signature depleted in d 13 C while enriched in d 15 N compared to marine organic compounds (Sarà et al, 2006;Yokoyama et al, 2006;Fernandez-Jover et al, 2011;Woodcock et al, 2017a;White et al, 2019;Woodcock et al, 2019;Grego et al, 2020;Sun et al, 2020). By feasting on aquaculture pellets and wastes, marine animals in close proximity to salmon farms may therefore exhibit altered FA and SI profiles that could be used to monitor the impact gradient of fish farming.…”

Section: Introductionmentioning

confidence: 99%

Suspension-Feeding Benthic Species’ Physiological and Microbiome Response to Salmon Farming and Associated Environmental Changes

et al. 2022

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Caged salmon farming is increasingly undertaken in water bodies with strong hydrodynamics where hard and mixed substrate habitats are more prevalent. Yet, these structurally complex and heterogeneous habitats support diverse benthic communities including several cnidarians and sponges that remain poorly characterized. This study used a combination of respirometry measurements, gas chromatography and 16S rRNA metabarcoding to define the respiration rate, stable carbon (δ13C) and nitrogen isotopes (δ15N), fatty acid (FA) and microbial profiles, and assess the impact of salmon farming on four important epibenthic suspension-feeders along the western Norwegian coast: the sponges Craniella and Weberella, the soft coral Duva florida and the anemone Hormathia digitata. Our results showed striking differences in fatty acid profiles and host microbiome communities in terms of identity, functional capabilities and genetic properties across the suspension-feeders. We found evidence of increased mortality rate in specimens located near fish farm activities and of a species-specific effect on respiration rate, with D. florida showing increased activity under the farm. Effects of fish farming on the suspension feeders were also species-specific and particularly evidenced by functional microbial turnover and by alteration of overall FA profiles in the soft coral and sea anemone. In particular, D. florida showed reduced level of FAs close to the farm (0-350 m), with significant difference in composition along a distance gradient. Only H. digitata showed evidence of incorporation of organic material from the fish farm waste via fatty acids trophic markers (FATM) and stable isotope analysis. Overall, our study demonstrates that suspension feeders have taxon-specific sensitivity towards the effect of salmon farming, and identified several potential molecular indicators that could be used as surrogate of impact gradient upon further research and validation. It also provides a wealth of ecological and physiological information on some of the most common sessile epibenthic organisms within Arctic and sub-Arctic regions, enabling us to better understand their response and evaluate their resilience to environmental changes.

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Is halophyte species growing in the vicinity of the shrimp ponds a promising agri-aquaculture system for shrimp ponds remediation in New Caledonia?

Colette

Guentas

Gunkel-Grillon

et al. 2022

Marine Pollution Bulletin

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The Depleted Carbon Isotopic Signature of Nematodes and Harpacticoids and Their Place in Carbon Processing in Fish Farm Sediments

Cited by 5 publications

References 77 publications

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Short-term changes in microbial communities in the water column around the fish farm in the Bay of Piran

Suspension-Feeding Benthic Species’ Physiological and Microbiome Response to Salmon Farming and Associated Environmental Changes

Is halophyte species growing in the vicinity of the shrimp ponds a promising agri-aquaculture system for shrimp ponds remediation in New Caledonia?

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