Chronic ammonia toxicity to duckweed-fed tilapia (Oreochromis niloticus)

El‐Shafai, Saber A.; El‐Gohary, Fatma A.; Nasr, Fayza A.; Steen, Peter; Gijzen, Huub J.

doi:10.1016/s0044-8486(03)00516-7

Cited by 146 publications

(75 citation statements)

References 26 publications

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“…Weekly, tank water samples were obtained at 9h to measure the concentrations of dissolved oxygen (DO 2 ; YSI 55 oxymeter) and total ammonia nitrogen (TAN; indophenol method). The concentrations of unionized ammonia (NH 3 ) in water were obtained by applying the results of TAN, pH and water temperature into the Emerson's formula (El-Shafai, El-Gohary, Nasr, Van Der Steen, & Gijzen, 2004).…”

Section: Methodsmentioning

confidence: 99%

<b>Interaction between afternoon aeration and tilapia stocking density

Lima

Cavalcante

Rebouças

et al. 2016

Acta Sci. Anim. Sci.

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ABSTRACT. The present study aimed at determining the effects of the interaction between afternoon aeration and stocking density of Nile tilapia on variables of water and soil quality, growth performance and effluent quality. The experiment was a 3 x 2 factorial randomized block design, with three stocking densities (8, 12 and 16 fish per tank or 43.5, 65.3, and 87.0 g m -3 ) under two mechanical aeration regimes, absence (control; three replicates) and afternoon aeration (four replicates). The afternoon aeration was carried out from 12.00 a.m. up to 18.00 p.m. from the 3 rd week until the end of the experiment. Except for the 16-fish tanks, the lowest concentrations of total ammonia nitrogen were found in the tanks with higher density of fish provided with afternoon aeration. Nitrite concentrations were lower in the 8-fish aerated tanks. In intensive system, the afternoon aeration of the fish culture water is an efficient management of water quality to remove gaseous ammonia and nitrite from water, but it is not appropriate to remove hydrogen sulfide from water.Keywords: fish farming, total ammonia nitrogen, unionized ammonia, nitrite.Interação entre aeração vespertina e densidade de estocagem na criação de juvenis de tilápia RESUMO. O presente trabalho teve por objetivo determinar os efeitos da interação entre a aeração vespertina da água e a densidade de estocagem de juvenis de tilápia do Nilo sobre variáveis de qualidade de água, solo, desempenho zootécnico e qualidade de efluentes. O delineamento experimental adotado foi em blocos ao acaso, em arranjo fatorial 3 x 2. Havia três densidades de estocagem (8, 12 e 16 peixes por tanque ou 43,5; 65,3 e 87,0 g m -3, respectivamente), em dois regimes de aeração mecânica da água, ausência (controle; três repetições) e aeração vespertina (quatro repetições). A aeração vespertina da água ocorreu das 12 às 18 h, da terceira até a última semana de criação. Exceto pelos tanques com 16 peixes, menores concentrações de nitrogênio amoniacal total foram observadas nos tanques de maior densidade de estocagem providos de aeração vespertina. As concentrações de nitrito da água foram menores nos tanques com 8 peixes e aeração vespertina. A aeração vespertina da água de cultivo de peixes é um eficiente manejo de qualidade de água para remoção de amônia gasosa e nitrito da água em sistemas intensivos, não sendo indicado, entretanto, para remoção de gás sulfídrico da água.Palavras-chave: piscicultura, nitrogênio amoniacal total, amônia não-ionizada, nitrito.

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Section: Methodsmentioning

confidence: 99%

<b>Interaction between afternoon aeration and tilapia stocking density

Lima

Cavalcante

Rebouças

et al. 2016

Acta Sci. Anim. Sci.

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“…The concentrations of NH3 − found in the experiment are lower than the concentration that cause significant effects in tilapia growth [21,22]. Thus, even when there were differences in NH3 − concentrations between RAS treatment and COR and PAK treatments in the a.m., there were no differences in final fish weight among treatments.…”

Section: Fish and Plant Productionmentioning

confidence: 86%

“…El-Shafai et al [21] and El-Sherif and El-Feky [21] had shown that chronic exposure to concentration levels higher than 0.1 mg/L of NH3 − can significantly inhibit growth in tilapia fingerlings, and that growth performance decreases and FCR increases as the concentration of NH3 − increases. The concentrations of NH3 − found in the experiment are lower than the concentration that cause significant effects in tilapia growth [21,22].…”

Section: Fish and Plant Productionmentioning

confidence: 99%

Evaluation of Biomass Yield and Water Treatment in Two Aquaponic Systems Using the Dynamic Root Floating Technique (DRF)

et al. 2015

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were measured in fish culture and hydroponic culture once a week at two times, morning (9:00 a.m.) and afternoon (3:00 p.m.). The fish biomass production was not different in any treatment (p > 0.05) and the total plant yield was greater (p < 0.05) in PAK than in COR. For the hydroponic culture in the a.m., the PO4 in PAK than in COR. The PAK treatment demonstrated higher food production and water treatment efficiency than the other two treatments.

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“…The toxic level of NH 3 for short-term exposure usually are reported in between 0.6 to 2 mg.L -1 , while the maximum tolerable concentration is to be 0.1 mg.L -1 (Pillay 1992). Moreover, the specific growth rate (SGR) of tilapia exposed to un-ionised ammonia nitrogen over 0.068 mg NH 3 was significantly reduced.The specific growth rate and the increasing of the unionised ammonia concentration increased the feed conversion ratio (El-Syafai 2004). Carbon dioxyde (CO 2 ) is another factor that may affect feed behaviour (Trand-Duy et al 2008).…”

Section: Water Quality and Nitrogen Dynamicsmentioning

confidence: 99%

Biomass production of Azolla microphylla as biofilter in a recirculating aquaculture system

2018

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Abstract. Sumoharjo, Ma'ruf M, Budiarto I. 2018.Biomass production of Azolla microphylla as biofilter in a recirculating aquaculture system. Asian J Agric 2: 14-19. This study utilized macrophyte (Azolla microphylla Kaulf.) as biofilter and perhaps that biomass produced in aquaculture system can be potential for alternative feed. This experiment such a first step of that vision and was aimed to determine the Azolla microphylla growth rate and its efficiency in removing ammonia from a simple recirculating aquaculture system. The experimental units were set up in three different water flow, i.e. 3 lpm, 5 lpm, and 7 lpm onto the three different geometrically baseboard of Tilapia (Oreochromis niloticus) growing tanks (prism, rectangular and limas).The result showed that water flow did not give significant effect(P < 0.10) on the growth rate of Azolla.The lower water flow (3 lpm) resulted in the highest amonia biofiltration efficiency which can remove ammonia up to 32.2±3.0% of the total NH 3 -N and NH 4 + -N (TAN).

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Chronic ammonia toxicity to duckweed-fed tilapia (Oreochromis niloticus)

Cited by 146 publications

References 26 publications

<b>Interaction between afternoon aeration and tilapia stocking density

<b>Interaction between afternoon aeration and tilapia stocking density

Evaluation of Biomass Yield and Water Treatment in Two Aquaponic Systems Using the Dynamic Root Floating Technique (DRF)

Biomass production of Azolla microphylla as biofilter in a recirculating aquaculture system

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