Combinations of Ulva and periphyton as biofilters for both ammonia and nitrate in mariculture fishpond effluents

Guttman, Louis; Boxman, Suzanne E.; Barkan, Roy; Neori, Amir; Shpigel, Muki

doi:10.1016/j.algal.2018.08.002

Cited by 21 publications

(4 citation statements)

References 30 publications

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“…However, the fact that fishpond effluent contains nitrate-nitrogen is a major drawback in the use of macroalgae biofilters, as uptake of this N-form by the algae requires great energy investment compared to uptake of ammonia. In recent years, marine periphyton has been identified for its potential in bio-conservation of waste nutrients in fishpond effluent, showing a simultaneous removal of both N-forms: ammonia and nitrate 22 , 27 . This is due to the co-existence of various organisms such as micro- and macro-algae, bacteria and other microorganisms in the periphyton mat 28 , 29 .…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the co-existence of various organisms such as micro- and macro-algae, bacteria and other microorganisms in the periphyton mat 28 , 29 . Moreover, in contrast to the high aeration required in Ulva biofilters, marine periphyton can be cultured relatively cheaply in unaerated biofilters requiring only light and artificial substrate like plastic nets for development 30 , while the oxygen produced in the biofilters can be further used to support fish production in the primary culture ponds 27 , 31 . As in other plant/algal biofilters, frequent harvesting of the periphytic biomass is required to keep both biomass production and nutrient removal rapid 22 , 30 , while the protein-rich harvested biomass is considered waste unless used for other purposes.…”

Section: Introductionmentioning

confidence: 99%

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Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Savonitto

Barkan

Harpaz

et al. 2021

Sci Rep

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Aquaculture threatens natural resources by fishing down the sea to supply fishmeal. Alternative protein sources in aquafeeds can provide a solution, particularly those that are waste from other operations and thereby reduce feed production costs. Toward this goal, we examined the waste biomass of marine periphyton from biofilters of an integrated multi-trophic aquaculture (IMTA) system as a replacement for fishmeal in diets of gilthead seabream (Sparus aurata). Four isoproteic (41%) and isolipidic (16.7%) aquafeeds were formulated with increased content of periphyton and a corresponding decrease in fishmeal from 20 to 15, 10, or 0%. The growth and biochemical content of seabream fingerlings (initial body weight 10 g) were examined over 132 days. Replacing 50% of fishmeal by waste periphyton improved feed conversion ratio (1.2 vs. 1.35 in the control diet) without harming fish growth. The complete replacement of fishmeal with periphyton resulted in 15% slower growth but significantly higher protein content in the fish flesh (59 vs. 52% in the control diet). Halving fishmeal content reduced feed cost by US$ 0.13 kg−1 feed and saved 30% in the cost of conversion of feed to fish biomass (US$ 0.58 kg−1 produced fish vs. $0.83 in the control diet). Finally, the total replacement of fishmeal by waste periphyton in the diet reduced the fish in—fish out ratio to below 1 (0.5–0.9) as compared to 1.36 in the control diet. Replacing fishmeal with on-farm produced periphyton minimizes aquaculture footprint through the removal of excess nutrients in effluents and the use of waste biomass to reduce the ‘fish in’ content in aquafeeds and fish production costs. The present study demonstrates the great practical potential of this dual use of marine periphyton in enhancing the circular economy concept in sustainable fish production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Savonitto

Barkan

Harpaz

et al. 2021

Sci Rep

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“…At the beginning of the experiment, 1 kg of fresh Ulva fasciata was collected from a production tank at IOLR-NCM and transferred to the experimental tanks holding a volume of 550 L each. An aeration system was installed at the bottom of each tank to control the concentration of oxygen and ensure that algae were kept circulating in the water column (Guttman et al, 2018 ). The macroalgae were harvested on a weekly basis so that only 1 kg of U. fasciata would be retained for development.…”

Section: Methodsmentioning

confidence: 99%

Temporal force governs the microbial assembly associated with Ulva fasciata (Chlorophyta) from an integrated multi-trophic aquaculture system

Nguyen,

Ovadia,

Guttman

2023

Front. Microbiol.

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Ulva spp., one of the most important providers of marine ecosystem services, has gained substantial attention lately in both ecological and applicational aspects. It is known that macroalgae and their associated microbial community form an inseparable unit whose intimate relationship can affect the wellbeing of both. Different cultivation systems, such as integrated multi-trophic aquaculture (IMTA), are assumed to impact Ulva bacterial community significantly in terms of compositional guilds. However, in such a highly dynamic environment, it is crucial to determine how the community dynamics change over time. In the current study, we characterized the microbiota associated with Ulva fasciata grown as a biofilter in an IMTA system in the Gulf of Aqaba (Eilat, Israel) over a developmental period of 5 weeks. The Ulva-associated microbial community was identified using the 16S rRNA gene amplicon sequencing technique, and ecological indices were further analyzed. The Ulva-associated microbiome revealed a swift change in composition along the temporal succession, with clusters of distinct communities for each timepoint. Proteobacteria, Bacteroidetes, Planctomycetes, and Deinococcus-Thermus, the most abundant phyla that accounted for up to 95% of all the amplicon sequence variants (ASVs) found, appeared in all weeks. Further analyses highlighted microbial biomarkers representing each timepoint and their characteristics. Finally, the presence of highly abundant species in Ulva microbiota yet underestimated in previous research (such as phyla Deinococcus-Thermus, families Saprospiraceae, Thiohalorhabdaceae, and Pirellulaceae) suggests that more attention should be paid to the temporal succession of the assembly of microbes inhabiting macroalgae in aquaculture, in general, and IMTA, in particular. Characterizing bacterial communities associated with Ulva fasciata from an IMTA system provided a better understanding of their associated microbial dynamics and revealed this macroalgae's adaptation to such a habitat.

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“…In contrast to Ulva, periphyton does not show N preference, exhibiting flexible shifts between TAN and NO 3 -N metabolism. Moreover, rapid and efficient removal of NO 3 -N by periphyton (up to 1.4g NO 3 -Nm -2 d -1 or removal of 63% of NO 3 -N) may occur in TAN-rich effluent ten-fold higher than that required for Ulva's transfer to NO 3 -N metabolism [20]. Since the specific uptake rate of TAN (in N gram -1 DW d -1 ) by periphyton is relatively similar to that of Ulva and much faster in the case of NO 3 -N, the combined biofiltration module is very promising for mariculture effluent.…”

Section: The Combination Of Seaweed Ulva Spp and Periphyton For Mariculture Effluentmentioning

confidence: 99%

Periphyton For Biofiltration And Fish Feeding in An Integrated Multi-Trophic Aquaculture System: A Case Study in The Gulf of Aqaba

Guttman

2019

OAJESS

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The environmental footprint of mariculture is a major obstacle towards expansion of this agro-industry. Additional economic constraints are the high costs of effluent treatment and expensive, non-sustainable ingredients in aquafeeds. Both Ulva and periphyton reveal great potential in nitrogen removal in mariculture effluent. To overcome the relatively minor uptake of nitrate by Ulva, a periphyton-based biofilter can be used either as a stand-alone biofiltration unit or as a polishing unit in an integrated Ulvaperiphyton biofilter. The biomass produced is rich in protein and is suitable for feeding of marine fish, served fresh on the plastic net substrate or included in pelleted aquafeeds to replace fishmeal.

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Combinations of Ulva and periphyton as biofilters for both ammonia and nitrate in mariculture fishpond effluents

Cited by 21 publications

References 30 publications

Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Fishmeal replacement by periphyton reduces the fish in fish out ratio and alimentation cost in gilthead sea bream Sparus aurata

Temporal force governs the microbial assembly associated with Ulva fasciata (Chlorophyta) from an integrated multi-trophic aquaculture system

Periphyton For Biofiltration And Fish Feeding in An Integrated Multi-Trophic Aquaculture System: A Case Study in The Gulf of Aqaba

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