Water quality, waste production, and off‐flavor characterization in a depuration system stocked with market‐size Atlantic salmon <i>Salmo salar</i>

Davidson, John; Redman, Natalie; Crouse, Curtis; Vinci, Brian J.

doi:10.1111/jwas.12920

Cited by 7 publications

(6 citation statements)

References 40 publications

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“…The characterization of the synthetic wastewater was carried out, the pH and conductivity analysis with the multiparameter HACH HQ40d, for which the sample of 100 mL of synthetic water was placed in a beaker and the reading was done with the equipment. Color analysis, COD, hexavalent chromium (Cr +6 ) and copper (Cu) were performed using the HACH DR500 spectrophotometer following the different processes stipulated in the water analysis manual (Davidson et al, 2022;Hach Company, 2000):…”

Section: Methodsmentioning

confidence: 99%

Study of the hydraulic correlation in the removal of pollutants from synthetic wastewater by means of a filter with Musa Paradisiaca

Mendoza

Rojas²,

Cunduri³

et al. 2023

F1000Res

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Background: The objective of this work was to decontaminate synthetic sewage from fouracid blue (BRL) dye, with characteristics similar to those of the textile industry, to determine the correlation between flow rate, permeability and removal of hexavalent chromium (Cr+ 6), Cupper (Cu), chemical oxygen demand COD and color using Paradise Muse filter bed. Methods: three concentrations of BRL synthetic wastewater were prepared, determining the initial concentrations of Color, pH, COD, Cr +6 and Cu. In addition, the hydraulic characteristics of the fiber were determined in four types of fiber cut. The synthetic wastewater was filtered in a filtration cell with the three fiber cuts, using three speeds, the time used for these tests was 180 minutes. Water samples were collected every 5 minutes and then analyzed in the laboratory. Simple exponential smoothing was performed on the data obtained, and the statistical analysis of variance ANOVA of 2 factors. Results: The results show that flow velocity and permeability are correlated with color removal, COD and Cr+ 6, determining that the best treatment was to use 1 cm fiber and high flow velocity in which 77.92% and 70.01% for color and COD respectively. In contrast, for Cr+ 6 the best treatment was fiber at 1 cm and low flow velocity removing up to 80% of the concentration of this contaminant and for Cu the best treatment was fiber at 3 cm and low flow velocity removing up to 88.69%. Conclusions: It was determined that the Musa Pardisiaca fiber is capable of absorbing contaminants, but the effectiveness of the treatment depends on the initial conditions of the synthetic water, the cut of the fiber and the velocity. In addition, it is important to mention that, in order to lower heavy metal concentrations, low flow rates should be used.

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Section: Methodsmentioning

confidence: 99%

Study of the hydraulic correlation in the removal of pollutants from synthetic wastewater by means of a filter with Musa Paradisiaca

Mendoza

Rojas²,

Cunduri³

et al. 2023

F1000Res

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“…52 Most recently, RAS reared Atlantic salmon of 5-6 kg were fasted for 1 day and then transferred to depuration tanks where they were fasted for another 7 days. 190 Here, geosmin and 2-methylisoboreal levels in water and fish were generally low, and it was concluded that a 7-day depuration period was excessive and that the fish could have been harvested after just 2-3 days, as long as gut evacuation was complete. 189 These examples suggest it is possible to manage and mitigate off-flavour compounds in RAS by manipulating environmental, microbial, and technological conditions.…”

Section: Feed Withdrawal In Rasmentioning

confidence: 99%

Fasting and its implications for fish welfare in Atlantic salmon aquaculture

Hvas,

Kolarevic,

Noble

et al. 2024

Reviews in Aquaculture

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Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Voluntary fasting is a coping response when fish have poor health or are exposed to poor farm environments. Owing to increased attention to animal welfare in aquaculture, concerns have been raised regarding ethical issues when farmed fish are subjected to fasting. However, thorough science‐based recommendations for fasting and feed‐withdrawal regimes have been lacking. The purpose of this review is to provide a synthesis of the various causes for fasting in Atlantic salmon aquaculture and evaluate their associated welfare implications so that guidelines for appropriate practices can be formulated. To interpret impacts, we describe biological responses and tolerance limits to fasting in Atlantic salmon and consider adaptations in the wild. Fry and parr are highly sensitive to feed withdrawal. However, post‐smolts and adults are well‐adapted to endure prolonged fasting without experiencing compromised functionality or health. Here, short periods of feed withdrawal prior to operations should therefore not constitute significant welfare concerns. Serious concerns are instead associated with voluntary fasting that may continue for weeks. We emphasize that environmental extremes that exceed appetite impairing thresholds must be avoided. Additionally, farmed fish should not be subjected to practices that lead to chronic stress that induce cessation of appetite. Diseases or parasites that impair appetite should also be mitigated. Fasting is here a symptom rather than a cause for poor welfare.

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“…The plastic cans with water were securely corked and stored in ice-packed containers before transporting them to the laboratory for analysis [40]. This was done within six hours of collection as advised by Davidson, et al [41].…”

Section: Sample Collectionmentioning

confidence: 99%

Lead, Zinc and Iron Pollutants Load Assessment in Selected Rivers in Southern Nigeria: Implications for Domestic Uses

Ushurhe,

Famous,

Gunn

et al. 2024

JWARP

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The aim of the study is to comparatively assess the concentrations of lead, zinc and iron in Rivers Ase, Warri and Ethiope, in Nigeria. Monthly water samples were collected from six randomly selected sites along the rivers course. 72 water samples were collected from each river at 0 -15 cm depths. Samples were analysed based on the standard methods recommended by the WHO for testing lead, zinc and iron. The assessment of the water quality was done using the Water Quality Index (WQI) of the Canadian Council of Ministers of the Environment (CCME-WQI). While hypotheses were tested using ANOVA. Findings indicated that CCME-WQI values were 47.3, 66.52 and 78.7. This meant that the water quality of River Ase is impaired and departed from desirable levels, while that of Warri and Ethiope were considered to occasionally be impaired and depart from desirable levels. The ANOVA model showed that there is a significant variation in heavy metal load in the selected rivers at P < 0.05. River water was put to domestic uses such as drinking (20.5%) preparing food (17.8%), bathing (19.8%), washing clothes and dishes (21.3%), brushing teeth (13.3%), and catering for domestic animals (7.5%). Poverty (49.5%) was the major reason for the use of river water for domestic purposes. The locals highlighted that they usually suffer from cholera (26.8%), diarrhoea (25.8%), dysentery (24%) and typhoid (23.5%) as a result of using the river water. The study recommended routine monitoring of anthropogenic and geologic activities, testing of the water regularly amongst others.

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Water quality, waste production, and off‐flavor characterization in a depuration system stocked with market‐size Atlantic salmon Salmo salar

Cited by 7 publications

References 40 publications

Study of the hydraulic correlation in the removal of pollutants from synthetic wastewater by means of a filter with Musa Paradisiaca

Study of the hydraulic correlation in the removal of pollutants from synthetic wastewater by means of a filter with Musa Paradisiaca

Fasting and its implications for fish welfare in Atlantic salmon aquaculture

Lead, Zinc and Iron Pollutants Load Assessment in Selected Rivers in Southern Nigeria: Implications for Domestic Uses

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