Biostimulation of in situ microbial degradation processes in organically-enriched sediments mitigates the impact of aquaculture

Ape, Francesca; Manini, Elena; Quero, Grazia Marina; Luna, Gian Marco; Sarà, Gianluca; Vecchio, Paolo; Brignoli, Pierlorenzo; Ansferri, Sante; Mirto, Simone

doi:10.1016/j.chemosphere.2019.03.178

Cited by 30 publications

(31 citation statements)

References 66 publications

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“…During the sampling period, seawater temperature ranged from 15 • C to 24 • C (in March and in July, respectively). The studied farm, as described by Ape et al (2019), is composed of 23 floating cages arranged in two rows, which cover a total surface of ∼8,000 m 2 . The cages contain sea bass (D. labrax) or sea bream (S. aurata) for a total annual production that exceeds 300 tons.…”

Section: Study Site and Sampling Strategymentioning

confidence: 99%

“…Sediment samples were collected as described in Ape et al (2019). Briefly, triplicate plexiglas corers (diameter 3,6 cm) were used for the analysis of the organic matter [specifically, biopolymeric organic carbon, or organic matter content (BPC); sensu Pusceddu et al, 2003], while sterile corers (sterile plastic syringes; diameter 3,5 cm) were used for microbial analyses (abundance, diversity).…”

Section: Study Site and Sampling Strategymentioning

confidence: 99%

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Temporal Changes in Microbial Communities Beneath Fish Farm Sediments Are Related to Organic Enrichment and Fish Biomass Over a Production Cycle

et al. 2020

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The marine fish farming industry is growing at a significant rate, yet a number of concerns still remain with regards to environmental impacts on the surrounding coastal sea and its biota. Here, we assessed the impact of intensive farming on benthic prokaryotic communities at a Mediterranean sea bass and sea bream intensive aquaculture site over a period of 10 months, in relation to the increase in fish biomass within the cage together with the organic matter enrichment in the sediments. We report positive relationships between prokaryotic abundance and both organic matter and fish biomass, and a contextual decrease in prokaryotic diversity below the cages. A significant shift in microbial community composition occurred in fish farm sediments (FF) over time, indicating a likely impact of ongoing aquaculture activity on prokaryotic communities. Among the dominant taxa at the impacted site, we found Epsilonproteobacteria and Bacteroidetes, which showed a general increase with fish biomass. Analyses on specialist taxa underlined significant contributions of Clostridiales and Bacteroidales in the farmed sediments. Finally, sea bream and sea bass gut microbiome-related taxa were detected during the sampling period. Our results indicate that prokaryotic community composition underneath the cages is related to fish biomass and organic enrichment over the course of production, and confirms that the study of benthic microbial communities at aquaculture sites represents a useful tool to assess the impact of intensive mariculture on the surrounding environment.

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Section: Study Site and Sampling Strategymentioning

confidence: 99%

Section: Study Site and Sampling Strategymentioning

confidence: 99%

Temporal Changes in Microbial Communities Beneath Fish Farm Sediments Are Related to Organic Enrichment and Fish Biomass Over a Production Cycle

et al. 2020

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“…The farm covers a total surface of ~8000 m 2 and encompasses 23 floating cages ar ranged in 2 rows containing sea bass Dicentrarchus labrax (Linnaeus, 1758) and sea bream Sparus aurata, Linnaeus, 1758, with a total annual production exceeding 300 t. The farm is located in a semi-enclosed and sheltered area characterized by limited hydro dynamic circulation and shallow depth (max depth ~10 m). Consequently, a large amount of organic matter, in the form of uneaten food and feces of the reared fish, accumulates on the sea floor under the cages, a phenomenon that appears to cause a progressive transformation of the benthic substrate into a muddy black sediment (Ape et al 2019). In addition, the area is periodically (from August to October) affected by hypoxia phenomena, with oxygen concentration dropping within the sublethal (sensu Sokolova et al 2012) range (~2 mg l −1 ) in aquatic invertebrates (Giomi & Pörtner, 2013).…”

Section: Study Area Experimental Design and Samplingmentioning

confidence: 99%

Functional role of biofouling linked to aquaculture facilities in Mediterranean enclosed locations

Montalto¹,

Mangano

Sarà

et al. 2020

Aquacult. Environ. Interact.

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Biofouling is generally considered a serious threat for human coastal activities such as aquaculture, and the ecological role of fouling organisms associated with fish-farm cages re mains one of the most debated topics in the ecological field. However, although biofouling may cause significant problems related to human health, environmental impact and financial losses, in the past decade there has been an increasing interest in developing methods to promote the growth of biofouling on artificial structures as a strategy to mitigate human impacts and reduce the organic enrichment caused by net-cage fish farming. Here we investigated the filtration activity of biofouling assemblages colonizing artificial substrata located within a harbor. The main objective of the study was to determine if and how changes in composition and functioning of biofouling may be affected by hypoxic conditions that periodically occur within the port site selected for this study. To this purpose, artificial panels were used as biofouling collectors and were brought back to the laboratory seasonally where they were divided in 3 subgroups and acclimated at 3 different oxygen levels to mimic the naturally occurring oxygenic conditions. Clearance and respiration rates of each community were measured 6 and 24 h after the beginning of each treatment. Regardless of experimental conditions, performance of the communities was affected by the seasonality and the amount of biomass recruiting on the panels, mainly composed of crustaceans, ascidians, polychaetes, seaweeds and several introduced species. Our study demonstrated that, in particular cases, fouling assemblages linked to aquaculture facilities may contribute to reducing environmental impact and at the same time may serve as input for their re-use in different disciplines.

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“…An example of this is given by ref. [9], who reported that the use of bioactivator for bioremediation was effective in promoting a shift from anaerobic to aerobic metabolism in the prokaryotic community, thus showing it to be a promising tool for mitigating the impact of fish farm sediments from aquaculture.…”

Section: Abundance As An Indicator For Ecosystem Healthmentioning

confidence: 99%

“…Ref. [9] reported on the substantial accumulation of organic matter on sediment underneath fish farms in the Mediterranean Sea. Furthermore, the recovery process of the microbenthic community may depend on environmental conditions, whereas modifications to the structure of benthic communities persists over a longer time period, negatively impacting benthic ecosystem functioning [10].…”

Section: Introductionmentioning

confidence: 99%

Biomonitoring of the Application of Monoculture and Integrated Multi-Trophic Aquaculture (IMTA) Using Macrobenthic Structures at Tembelas Island, Kepulauan Riau Province, Indonesia

Putro

Sharani

Widowati

et al. 2020

JMSE

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Sustainable aquaculture needs to be considered when it comes to the utilization of water resources. The aim of this study was to apply biomonitoring using macrobenthic structures on both spatial and temporal applications of monoculture and integrated multi-trophic aquaculture (IMTA) at Tembelas Island, Kepulauan Riau Province, Indonesia. Samples of sediment were taken from three fish farm locations, namely from an IMTA site, a monoculture site, and a reference site. Macrobenthic organisms obtained through rinsing, sieving, and sorting were then identified under a stereo-microscope. Diversity of the macrobenthic assemblages was analyzed with a Shannon-Wiener index (H’). Equitability was expressed through Pielou’s evenness index. Finally, Bray-Curtis’ non-metric multi-dimensional scaling (NMDS) was used for similarities derived from log (X+1) transformed macrobenthic abundance to provide a visual representation of differences in their structure between sites over time. Results showed polychaetes exhibited differences in both variation and abundance of genera between the farm and reference site. The assemblage of macrobenthos at the IMTA site consisted of 9 genera of gastropods, 3 genera of bivalves, 5 genera of polychaetes, and 2 genera of crustaceans. At the monoculture site, 12 genera of gastropods, 4 genera of bivalves, 8 genera of polychaetes, 1 genera of crustaceans, and 1 genera of ophiuroid were observed. A relatively high abundance was observed at the reference site, with 27 genera of gastropods, 11 genera of bivalves, 3 genera of polychaetes, and 1 genera of crustacean. The favorable water conditions and possible absence of waste input from aquaculture resulting in a more suitable habitat for macrobenthic life may explain this relative abundance. Some of them were recognised as opportunistic taxa, i.e., Capitella sp., Heteromastus sp., and Lumbrinereis sp. Based on the diversity and evenness indices and the MNDS ordination, it can be concluded that the application of IMTA systems results in a suppressed or reduced potential impact on environmental disturbance due to aquacultural activities.

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Biostimulation of in situ microbial degradation processes in organically-enriched sediments mitigates the impact of aquaculture

Cited by 30 publications

References 66 publications

Temporal Changes in Microbial Communities Beneath Fish Farm Sediments Are Related to Organic Enrichment and Fish Biomass Over a Production Cycle

Temporal Changes in Microbial Communities Beneath Fish Farm Sediments Are Related to Organic Enrichment and Fish Biomass Over a Production Cycle

Functional role of biofouling linked to aquaculture facilities in Mediterranean enclosed locations

Biomonitoring of the Application of Monoculture and Integrated Multi-Trophic Aquaculture (IMTA) Using Macrobenthic Structures at Tembelas Island, Kepulauan Riau Province, Indonesia

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