The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Rita Triebskorn - One of the best experts on this subject based on the ideXlab platform.

  • Does wastewater treatment plant upgrading with activated carbon result in an improvement of Fish Health
    Aquatic toxicology (Amsterdam Netherlands), 2017
    Co-Authors: Sabrina Wilhelm, Anja Henneberg, Heinz-r. Köhler, Magali Rault, Doreen Richter, Marco Scheurer, Séverine Suchail, Rita Triebskorn
    Abstract:

    In the present study, the efficiency of a wastewater treatment plant (WWTP) upgraded with a powdered activated carbon unit for the reduction of micropollutants and the related advantages for Fish Health have been analyzed by means of different biomarkers, i.e. histopathological investigations, analyses of glycogen content and stress proteins, as well as by chemical analyses in different matrices. Comparative analyses were conducted prior and subsequent to the installation of the additional purification unit. Chemical analyses revealed a significant reduction of several pharmaceuticals, including diclofenac, carbamazepine and metoprolol, in samples of effluent and surface water downstream of the WWTP after its upgrade. In addition, diminished concentrations of diclofenac and PFOS were detected in tissues of analyzed Fish. Histopathological investigations of Fish liver, gills, and kidney revealed improved tissue integrity in Fish after improved wastewater treatment. In parallel, biochemical measurements of glycogen revealed increased energy resources in Fish liver and, furthermore, hsp70 levels in livers of exposed rainbow trout and in kidneys of exposed brown trout were lower after than before the WWTP upgrade. In summary, additional treatment with powdered activated carbon led to a reduction of potentially hazardous chemicals in the effluent and the adjacent river and, consequently, to an improvement of Fish Health in the receiving water course.

  • Impact of wastewater on Fish Health: a case study at the Neckar River (Southern Germany) using biomarkers in caged brown trout as assessment tools
    Environmental science and pollution research international, 2015
    Co-Authors: Krisztina Vincze, Heinz-r. Köhler, Volker Scheil, Bertram Kuch, Rita Triebskorn
    Abstract:

    The present work describes a field survey aiming at assessing the impact of a sewage treatment plant (STP) effluent on Fish Health by means of biomarkers. Indigenous Fish were absent downstream of the STP. To elucidate the reason behind this, brown trout (Salmo trutta f. fario) were exposed in floating steel cages up- and downstream of a STP located at the Neckar River near Tubingen (Southern Germany), for 10 and 30 days. A combination of biomarker methods (histopathological investigations, analysis of the stress protein Hsp70, micronucleus test, B-esterase assays) offered the possibility to investigate endocrine, geno-, proteo- and neurotoxic effects in Fish organs. Biological results were complemented with chemical analyses on 20 accumulative substances in Fish tissue. Even after short-term exposure, biomarkers revealed clear evidence of water contamination at both Neckar River sites; however, physiological responses of caged brown trout were more severe downstream of the STP. According to this, similar bioaccumulation levels (low μg/kg range) of DDE and 12 polycyclic aromatic hydrocarbons (PAHs) were detected at both sampling sites, while up to fourfold higher concentrations of four PAHs, methyl-triclosan and two synthetic musks occurred in the tissues of downstream-exposed Fish. The results obtained in this study suggest a constitutive background pollution at both sites investigated at the Neckar River and provided evidence for the additional negative impact of the STP Tubingen on water quality and the Health condition of Fish.

C. Stephen - One of the best experts on this subject based on the ideXlab platform.

  • Role of risk assessment in Fish Health policy and management
    ICES Journal of Marine Science, 2001
    Co-Authors: C. Stephen
    Abstract:

    Fish Health management occurs in a complex ecological and socio-economic system, in an uncertain and uncontrollable environment, and with a lack of empirical data. Increasingly, regional, national, and international policies require some form of risk assessment to help make reasonable decisions. Despite its increasing use and popularity, there are many criticisms of risk assessment as a basis for Fish Health management decisions. Underlying these criticisms are three common elements: (1) unrealistic expectations of the ability of risk assessments to identify the “right” decision; (2) inadequate predictive ability of Fish Health risk assessment models; and (3) the lack of integration or consideration of management, societal, and scientific concerns. Rather than abandoning risk assessment as a basis for management because of its quantitative limitations, the concept should be fully explored and applied in order to facilitate socially and ecologically relevant Fish Health management decisions. Moreover, efforts should be undertaken to educate managers and stakeholders as to the role of risk assessment in decision support and in exploring additional models for describing and assessing the impacts of Fish Health management decisions.

Shai Arnon - One of the best experts on this subject based on the ideXlab platform.

  • Impact of treated wastewater reuse and floods on water quality and Fish Health within a water reservoir in an arid climate.
    The Science of the total environment, 2016
    Co-Authors: Inbal Zaibel, Dina Zilberg, Ludmila Groisman, Shai Arnon
    Abstract:

    Treated wastewater (TWW) reuse for agricultural irrigation is a well-established approach to coping with water shortages in semi-arid and arid environments. Recently, additional uses of TWW have emerged, including streamflow augmentation and aquatic ecosystem restoration. The purpose of the current study was to evaluate the water quality and Fish Health, in an artificial reservoir located in an arid climate (the Yeruham Reservoir, Israel), which regularly receives TWW and sporadic winter floods. The temporal distribution of water levels, nutrients and organic micropollutants (OMPs) were measured during the years 2013–2014. OMPs were also measured in sediment and Fish tissues. Finally, the status of Fish Health was evaluated by histopathology. Water levels and quality were mainly influenced by seasonal processes such as floods and evaporation, and not by the discharge of TWW. Out of 16 tested OMPs, estrone, carbamazepine, diclofenac and bezafibrate were found in the reservoir water, but mostly at concentrations below the predicted no-effect concentration (PNEC) for Fish. Concentrations of PCBs and dioxins in Fish muscle and liver were much lower than the EU maximal permitted concentrations, and similar to concentrations that were found in food Fish in Israel and Europe. In the histopathological analysis, there were no evident tissue abnormalities, and low to moderate infection levels of Fish parasites were recorded. The results from the Yeruham Reservoir demonstrated a unique model for the mixture effect between TWW reuse and natural floods to support a unique stable and thriving ecosystem in a water reservoir located in an arid region. This type of reservoir can be widely used for recreation, education, and the social and economic development of a rural environment, such as has occurred in the Yeruham region.

Julia N. Sharova - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of Fish Health Status Under Long-Term Water Pollution : Vygozero Reservoir , North-West Russia
    Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference, 2015
    Co-Authors: Lidia A. Belicheva, Julia N. Sharova
    Abstract:

    Environmental pollution and its effects on the Health of aquatic ecosystems is a great problem that has been studied intensely in the last years. The Vygozero reservoir is one of the largest water bodies of the Karelian Republic. Its ecosystem has undergone significant changes since the 1930s mainly due to anthropogenic influence from the development of pulp and paper mill industry leading to accumulation of toxic contaminants and eutrophication. At present, the water body has been shown to be also polluted by hydrocarbon products and heavy metals. Among the huge changes in Vygozero ecosystem is the decrease of some Fish populations and partial loose of commercial Fishing importance. Despite the obvious changes in Fish population the chronic biological effects of the Vygozero reservoir pollution on Fish organism are poorly studied. This study is concerned with the evaluation of pollution influence on Fish Health status and establishment relation between Fish Health and environmental quality. The parameters selected for this aim were the occurrence of gills, liver and kidney alterations, as histopathological changes are widely used as biomarkers in the evaluation of the Health of Fish exposed to contaminants. Our findings confirm chronic pollution of the Vygozero reservoir. Histological analysis of Fish tissues revealed a variety of progressive, regressive, inflammatory, circulatory disturbances and neoplastic changes. Observed histological alterations indicate that organism of Fish from Vygozero reservoir responses to the impaired environment quality. Revealed histopathologies are sings of metabolic disorders, immunity suppression, compensatory reactions development and functional abnormalities in vital organs of studied Fish. The results of the study correspond to the prior research devoted to ascertain tissue changes in different Fish species taken from an area with chronic multiple anthropogenic impact. So it can be concluded that histopathological lesions are result of long-term effect of toxic xenobiotics.

  • Assessment of Fish Health status in the Pechora River: effects of contamination.
    Ecotoxicology and environmental safety, 2010
    Co-Authors: A. Lukin, Julia N. Sharova, Lidia A. Belicheva, L. Camus
    Abstract:

    The present study aimed to assess the ecological situation in the Pechora River Basin (east part of Sub-Arctic Russia) using histopathologies of Fish and to relate Fish Health to environmental quality. This paper reports histopathological alterations of Fish kidney, liver, and gills and their association with chemical contamination of the Pechora River. A variety of histopathological changes was found. Differences between studied species and sites of the Pechora River with regard to the type, prevalence, and severity of lesions were studied. The types of the lesions indicated that Fish respond to both direct toxicant effects of contaminated water and sediment, and secondary stress effects caused by factors such as parasitism. The structural modifications found in this study are a result of acute damage associated with short-term exposure as much as chronic response due to long-term pollution.

Lisa Jacquin - One of the best experts on this subject based on the ideXlab platform.

  • Direct and indirect effects of multiple environmental stressors on Fish Health in human-altered rivers.
    The Science of the total environment, 2020
    Co-Authors: Quentin Petitjean, Séverine Jean, Jessica Cöte, Thibaut Larcher, Frédéric Angelier, Cecile Ribout, Annie Perrault, Pascal Laffaille, Lisa Jacquin
    Abstract:

    Abstract Freshwater Fish face multiple challenges in human-altered rivers such as trace metal contamination, temperature increase and parasitism. These multiple stressors could have unexpected interactive effects on Fish Health due to shared physiological pathways, but few studies investigated this question in wild Fish populations. In this study, we compared 16 populations of gudgeon (Gobio occitaniae) distributed along perturbation gradients in human-altered rivers in the South of France. We tested the effects of single and combined stressors (i.e., metal contamination, temperature, parasitism) on key traits linked to Fish Health across different biological levels using a Structural Equation Modelling approach. Parasitism and temperature alone had limited deleterious effects on Fish Health. In contrast, Fish living in metal-contaminated sites had higher metal bioaccumulation and higher levels of cellular damage in the liver through the induction of an inflammatory response. In addition, temperature and contamination had interactive negative effects on growth. These results suggest that trace metal contamination has deleterious effects on Fish Health at environmentally realistic concentrations and that temperature can modulate the effects of trace metals on Fish growth. With this study, we hope to encourage integrative approaches in realistic field conditions to better predict the effects of natural and anthropogenic stressors on aquatic organisms.

  • Direct and indirect effects of multiple environmental stressors on Fish Health in human-altered rivers
    Science of the Total Environment, 2020
    Co-Authors: Quentin Petitjean, Séverine Jean, Jessica Cöte, Thibaut Larcher, Frédéric Angelier, Cecile Ribout, Annie Perrault, Pascal Laffaille, Lisa Jacquin
    Abstract:

    • Multiple environmental stressors can affect Fish Health at different biological levels. • Parasitism and water temperature had limited effects on gudgeon Health. • Trace metal contamination indirectly increased liver lesions through over-inflammation. • Combined contamination and temperature decreased Fish growth. • Multiple stressors have complex interactive effects on Fish Health in human-altered rivers. Freshwater Fish face multiple challenges in human-altered rivers such as trace metal contamination, temperature increase and parasitism. These multiple stressors could have unexpected interactive effects on Fish Health due to shared physiological pathways, but few studies investigated this question in wild Fish populations. In this study, we compared 16 populations of gudgeon (Gobio occitaniae) distributed along perturbation gradients in human-altered rivers in the South of France. We tested the effects of single and combined stressors (i.e., metal contamination , temperature, parasitism) on key traits linked to Fish Health across different biological levels using a Structural Equation Modelling approach. Parasitism and temperature alone had limited deleterious effects on Fish Health. In contrast, Fish living in metal-contaminated sites had higher metal bioaccumulation and higher levels of cellular damage in the liver through the induction of an inflammatory response. In addition, temperature and contamination had interactive negative effects on growth. These results suggest that trace metal contamination has deleterious effects on Fish Health at environmentally realistic concentrations and that temperature can modulate the effects of trace metals on Fish growth. With this study, we hope to encourage integrative approaches in realistic field conditions to better predict the effects of natural and anthropogenic stressors on aquatic organisms.