The influence of the coagulant PAX-18 on Planktothrix agardhii bloom in a shallow eutrophic fishpond.

Lelková, Eva; Rulı́k, Martin; Hekera, Petr; Dobiáš, Pavel; Dolejš, Petr; Borovičková, Marcela; Poulíčková, Aloisie

doi:10.5507/fot.2008.013

Cited by 16 publications

(13 citation statements)

References 18 publications

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“…Masuda and Boyd () showed that treatments with aluminum sulfate, or alum, reduces soluble reactive phosphorus and total phosphorus concentrations in catfish ponds. They did not evaluate the effects on cyanobacterial abundance or off‐flavor incidence but studies in other water bodies (De Julio, Fioravante, De Julio, Oroski, & Graham, ; Lam & Prepas, ), including fishponds in the Czech Republic (Lelkova et al, ), show that addition of aluminum salts can remove cyanobacterial cells from water, implying that production of odorous compounds may be interrupted, at least temporarily. And that is the catch—addition of aluminum salts to water does not cause a long‐term increase in Al 3+ concentrations because aluminum ions are quickly converted to insoluble aluminum hydroxides that precipitate to the bottom.…”

Section: Preventing Cyanobacterial Off‐flavorsmentioning

confidence: 99%

“…And that is the catch—addition of aluminum salts to water does not cause a long‐term increase in Al 3+ concentrations because aluminum ions are quickly converted to insoluble aluminum hydroxides that precipitate to the bottom. Because there is little residual effect, conditions soon return to those existing before treatment unless direct inputs of phosphorus are concurrently and permanently reduced (Lelkova et al, ). The lack of long‐lasting effects of aluminum salts will be especially noticeable in catfish ponds where phosphorus concentrations increase quickly in response to large, daily inputs of phosphorus from feed.…”

Section: Preventing Cyanobacterial Off‐flavorsmentioning

confidence: 99%

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Off‐flavors in pond‐grown ictalurid catfish: Causes and management options

Tucker

Schrader

2019

J World Aquaculture Soc

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Ictalurid catfish grown in ponds often acquire undesirable off-flavors prior to harvest. Off-flavors develop when odorous, lipophilic substances in food or water are absorbed across gut or gill epithelium and concentrated in edible tissues. The most common causes of catfish off-flavors are two nontoxic secondary metabolites of planktonic cyanobacteria: geosmin (causing an earthy off-flavor) and 2-methylisoborneol (causing a musty off-flavor). Offflavored fish are unacceptable for processing, and harvest must be postponed until the source of the odorous compound disappears and the compound purges from edible fish tissue. Harvest delays caused by episodes of off-flavor increase production time, interrupt cash flow, and increase the risk of fish loss. Catfish farmers consider off-flavor to be one of their most important production-related problems. This paper reviews the causes of off-flavor in catfish, pharmacokinetics of uptake and loss of odorous compounds in catfish, seasonality and prevalence of off-flavors, farm-and industry-level impacts, the ecology of cyanobacteria in catfish ponds, and various strategies for preventing or treating cyanobacterial (and other) off-flavors. A decision-making system based on knowledge gained from research is presented as a guide to effective use of the limited tools available to manage off-flavors. K E Y W O R D S 2-methylisoborneol, blue-green algae, catfish, cyanobacteria, geosmin, off-flavor

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Section: Preventing Cyanobacterial Off‐flavorsmentioning

confidence: 99%

Section: Preventing Cyanobacterial Off‐flavorsmentioning

confidence: 99%

Off‐flavors in pond‐grown ictalurid catfish: Causes and management options

Tucker

Schrader

2019

J World Aquaculture Soc

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“…In jar tests, Pan et al found (2006a) a removal efficiency of up to 95 % in 75 min for Microcystis aeruginosa, depending on the salinity and chitosan modification of the used sepiolite and kaolinite. In a 32 m 2 enclosure in Lake Taihu, a removal efficiency of 99 % of chlorophyll a (i.e., from 2000 to 20 lg l -1 ) and 42 % of dissolved phosphate was obtained with chitosan-modified local soils (Pan et al 2006b (Lelkova et al 2008;De Julio et al 2010;Jančula and Maršálek 2011). Lelkova et al (2008) successfully flocculated Planktothrix agardhii dosing PACl in a fishpond.…”

Section: Chemicalmentioning

confidence: 99%

“…In a 32 m 2 enclosure in Lake Taihu, a removal efficiency of 99 % of chlorophyll a (i.e., from 2000 to 20 lg l -1 ) and 42 % of dissolved phosphate was obtained with chitosan-modified local soils (Pan et al 2006b (Lelkova et al 2008;De Julio et al 2010;Jančula and Maršálek 2011). Lelkova et al (2008) successfully flocculated Planktothrix agardhii dosing PACl in a fishpond. Sulfate compounds are less suitable due to the possible formation of iron sulfide (FeS), which reduces the phosphate binding capacities of lake sediments (Hansen et al 2003).…”

Section: Chemicalmentioning

confidence: 99%

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Stroom

Kardinaal

2016

Aquat Ecol

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Water managers worldwide are facing the serious problem of dense blooms of cyanobacteria in surface waters. In the quest for the optimal method to combat cyanobacterial dominance, many questions and many possible solutions arise. This paper presents a three-phase strategy to fight harmful cyanobacterial proliferation. Water managers who apply this strategy can generate a tailor-made set of measures. The three phases consist of (1) defining the ecological water quality targets of the waterbody in question, (2) assessing its current ecological state, and (3) selecting which measures will yield optimal results. The paper provides assistance in the quantitative diagnosis of the state of both shallow and deep temperate freshwater lakes by means of a lake system analysis, and presents a survey of measures. Measures are divided into two sets. Preventive measures are based on switching to a clear state (shallow lake) or reducing the overall cyanobacterial biomass (deep lake). They are subdivided into nutrient reduction, hydromorphological adjustments, and food web management. Concerning nutrient reduction, in many situations phosphorus management alone should suffice. Nitrogen management can be important to increase the species diversity of macrophytes, or to relieve downstream (marine) consequences. Control measures (including mitigation) have a direct impact on cyanobacterial blooms by biomass removal, flushing, or mixing; however, the number of proven technologies is limited.

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“…Free dissolved phospho-rus and nitrogen are important nutrients for photosynthetic organisms [5], mainly for cyanobacterial blooms [6,7]. Eutrophication causes considerable changes in biochemical cycles and biological communities [8]. Community interaction in pelagic food webs is affected by large scale of physical, chemical and biological processes and are govern by nutrient limitation, competition, predation and other ecological forces [9,10].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Succession of the Plankton and Microbenthos in a Hypertrophic Shallow Water Reservoir at Modra (W Slovakia)

Illyová

Hindák²,

Hindáková³

et al. 2013

JEP

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The seasonal development of the phytoplankton, phytobenthos, zooplankton, and microbenthos in a high eutrophised intravilan water reservoir was studied. Finally, 25 genera with 44 species of Cyanobacteria/Cyanophytes and 67 genera with 102 species as well as infraspecific taxa of different groups of microscopic algae were identified. The phytoplankton in most parts of the water basin was strongly dominated by green colonial alga Golenkiniopsis longispina. From October until December a cyanophyte species Aphanocapsa delicatissima with typical cell dimensions of picoplankton/ was found in large amounts/predominated. As early as spring, a plankton bloom in all its components was observed. At that time, also a high concentration of total phosphorus was recorded, which in the second half of April dropped rapidly. The concentration of chlorophyll-a increased from 162.7 μg/L in March to 2322 μg/L in September. Massive occurrence of benthic protozoa in the plankton, as a consequence of anoxia, has been observed. Further, the detritivore and omnivore ciliate species Coleps hirtus dominated in the microbenthos. Altogether 74 of ciliate taxa were detected. Their abundance and biomass reached peak in April, but these steadily decreased from May until the end of the year. Extreme values of zooplankton density (54,016 ind/L) were recorded in spring followed by a sudden fall in summer and autumn. The contribution of rotifers (Brachionus spp., Filinia longiseta) in the total zooplankton density and biomass was 98%. Relatively a low species richness of crustaceans (4 Cladocera and 3 Copepoda) was observed.

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The influence of the coagulant PAX-18 on Planktothrix agardhii bloom in a shallow eutrophic fishpond.

Cited by 16 publications

References 18 publications

Off‐flavors in pond‐grown ictalurid catfish: Causes and management options

Off‐flavors in pond‐grown ictalurid catfish: Causes and management options

How to combat cyanobacterial blooms: strategy toward preventive lake restoration and reactive control measures

Seasonal Succession of the Plankton and Microbenthos in a Hypertrophic Shallow Water Reservoir at Modra (W Slovakia)

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