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  • Articles  (444)
  • lead
  • mercury
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  • 1
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    Effect of mercury contamination on the hepatopancreas ultrastructure of Armadillo officinalis duméril, 1816 (crustacea, isopoda) (2021)
    Details
    Publication Date: 2021-10-27
    Description: This study aimed to evaluate the effect of substrate contamination by mercury on the hepatopancreas of the Crustacean species; Armadillo officinalis Duméril, 1816. Uncontaminated specimens were collected from the banks of Ghar El Melh lagoon then exposed for three weeks to three concentrations of mercury salt solution. After the end of the exposure, the hepatopancreas of unexposed and exposed animals were compared to detect histological changes. Transmission Electron Microscopy observations showed that the hepatopancreas of Hg-exposed animals showed morphological and histological changes compared with control animals even at the lowest concentration. The degree of these alterations was found to be dose-dependent. The global predominant features were: microvillus border disruption, condensation of some cytoplasm areas and of chromatin, rough endoplasmic reticulum and mitochondrial alterations, lipid droplets modifications in addition to the increasing number of B-granules in the B and S cells.
    Description: Cette étude vise à évaluer l’effet de la contamination du substrat par le mercure sur l’hépatopancréas de l’espèce de Crustacés; Armadillo officinalis Duméril, 1816. Des échantillons non contaminés ont été recueillis sur les rives de la lagune de Ghar El Melh, puis exposés pendant trois semaines à trois concentrations de solution de sel de mercure. A la fin de l'exposition, l’hépatopancréas des animaux non exposés et exposés ont été comparés pour détecter les modifications histologiques. Les observations en microscopie électronique à transmission ont montré que l'hépatopancréas des animaux exposés au mercure présentait des changements morphologiques et histologiques par rapport aux animaux témoins, même à la concentration la plus faible. Le degré de ces altérations s'est avéré dépendant de la dose. Les principales caractéristiques globales étaient: la rupture de la frontière des microvillosités, la condensation de certaines zones du cytoplasme et de la chromatine, l’altération du réticulum endoplasmique rugueux et des mitochondries, la modification des gouttelettes lipidiques en plus du nombre croissant de granules B dans les cellules B et S.
    Description: Published
    Description: Refereed
    Keywords: Crustaceans ; mercury ; ultrastructure ; storage organ ; substrate contamination ; mercury ; Armadillo officinalis ; Crustacean ; hepatopancreas
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: 119-124
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  • 2
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    Mercury levels in marine and estuarine fishes of Florida (2021)
    Florida Marine Research Institute | St. Petersburg, FL
    In:  http://aquaticcommons.org/id/eprint/26026 | 20978 | 2018-10-15 00:08:23 | 26026 | Florida Fish and Wildlife Conservation Commission
    Details
    Publication Date: 2021-07-24
    Description: Because mercury, a toxic metallic element, has been shown to bioaccumulate in fish tissue, humans consuming fish can potentially consume significant levels of mercury. Limited information is available on mercury levels in Florida’s marine and estuarine fish species. We examined the concentration of mercury in 2,832 fish representing 81 species from 32 families. Species represented all major trophic groups, from primary consumers to apex predators. Mercury concentrations in individual fish varied greatly within and among species. However, the majority of individuals we examined contained low concentrations. Species with very low mean or median mercury concentrations tended to be planktivores, detritivores, species that feed on invertebrates, or species that feed on benthic invertebrates and small fish. Apex predators typically had the highest mercury concentrations. In most species, mercury concentration increased as fish size increased. Sampling in Florida waters is continuing, and future research relating mercury levels to fish age, feeding ecology, and the trophic structure of Florida’s marine and estuarine ecosystems will help us to further identify important sources of variation.
    Keywords: Biology ; Fisheries ; Pollution ; mercury ; fishes ; Florida
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 35
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  • 3
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    Determination of mercury (Hg) in two sea cucumber species Ohshimella ehrenbergii (Selenka, 1868) and Stolus buccalis (Stimpson, 1855) from the Karachi coast (2021)
    In:  http://aquaticcommons.org/id/eprint/27018 | 25017 | 2020-05-07 03:17:02 | 27018 | University of Karachi. Marine Reference Collection and Resource Centre
    Details
    Publication Date: 2021-07-24
    Description: In this study the amounts of mercury (Hg) were determined in tentacles and muscle tissues of O. ehrenbergii and S. buccalis from two coastal sites of Karachi; Buleji and Sunehri during Southwest monsoon (August and September) and Northeast monsoon (December and January) seasons of the year 2018. The mean amounts of Hg in edible tissues of sea cucumbers were as follows: O. ehrenbergii (0.0176 mg/kg dry wt.) and S. buccalis (0.0155 mg/kg dry wt.). Hg amounts in muscles of both species are much lower than the maximum permissible limits (0.5 mg/kg wet wt.). Estimated Daily Intakes for adults consuming O. ehrenbergii and S. buccalis are lower than published RfD values. Total Target Hazard Quotient (TTHQ) values (0.00787) are also lower than 1, it may be concluded that the consumption of these sea cucumbers from Karachi, do not pose any health hazards to human as Hg amounts were concerned.
    Description: Higher Education Commission of Pakistan
    Keywords: Biology ; Pollution ; Ohshimella ehrenbergii ; Stolus buccalis ; mercury ; Buleji ; Sunehri ; Karachi ; estimated daily intakes ; target ; hazard ; quotient
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 55-62
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  • 4
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    Final Evaluation Memorandum: Strategies for Resolving Low Dissolved Oxygen and Methylmercury Events in Northern Suisun Marsh (2021)
    State Water Resources Control Board | Sacramento, CA
    In:  stuart@swampthing.org | http://aquaticcommons.org/id/eprint/6470 | 393 | 2020-08-24 04:45:31 | 6470 | Bachand & Associates
    Details
    Publication Date: 2021-07-14
    Description: The purpose of the project is to improve our understanding about best management practices that can be utilized on diked managed wetlands in Suisun Marsh for reducing the occurrence of low dissolved oxygen (DO) and high methylmercury (MeHg) events associated primarily with fall flood-up practices. Low DO events are of concern because they can lead to undue stress and even mortality of sensitive aquatic organisms. Elevated MeHg levels are of concern because MeHg is a neurotoxin that bio-magnifies up the food chain and can cause deleterious effects to higher trophic level consumers such as piscivorous fish, birds, and mammals (including humans). This study involved two years (2007-2008) of intensive field data collection at two managed wetland sites in northwest Suisun Marsh and their surrounding tidal sloughs, an area with prior documented low DO events. In addition, the study collected limited soils and water quality field data and mapped vegetation for three managed wetland sites in the central interior of Suisun Marsh, for the purpose of examining whether wetlands at other locations exhibit characteristics that could indicate potential for similar concerns. In Year 1 of the study, the objective was to identify the baseline conditions in the managed wetlands and determine which physical management conditions could be modified for Year 2 to reduce low DO and MeHg production issues most effectively. The objective of Year 2 was to evaluate the effectiveness of these modified management actions at reducing production of low DO and elevated MeHg conditions within the managed wetlands and to continue improving understanding of the underlying biogeochemical processes at play. This Final Evaluation Memorandum examined a total of 19 BMPs, 14 involving modified water management operations and the remaining five involving modified soil and vegetation management practices. Some of these BMPs were previously employed and others have not yet been tested. For each BMP this report assesses its efficacy in improving water quality conditions and potential conflicts with wetland management. It makes recommendations for further study (either feasibility assessments or field testing) and whether to consider for future use. Certain previously used BMPs were found to be important contributors to poor water quality conditions and their continued use is not recommended. Some BMPs that could improve water quality conditions appear difficult to implement in regards to compatibility with wetland management; these BMPs require further elaboration and feasibility assessment to determine whether they should be field tested. In practice for any given wetland, there is likely a combination of BMPs that would together have the greatest potential to address the low DO and high MeHg water quality concerns. Consequently, this report makes no sweeping recommendations applicable to large groups of wetlands but instead promotes a careful consideration of factors at each wetland or small groups of wetlands and from that assessment to apply the most effective suite of BMPs.This report also identifies a number of recommended future actions and studies. These recommendations are geared toward improving the process understanding of factors that promote low DO and high MeHg conditions, the extent of these problems in Suisun Marsh, the regulatory basis for the DO standards for a large estuarine marsh, the economics of BMPs, and alternative approaches to BMPs on diked managed wetlands that may address the water quality issues. The most important of these recommendations is that future BMP implementation should be carried out within the context of rigorous scientific evaluation so as to gain the maximum improvement in how to manage these water quality issues in the diked managed wetlands of Suisun Marsh.
    Description: State Water Resources Control Board
    Description: Project Number 06-283-552-0
    Keywords: Agriculture ; Chemistry ; Engineering ; Environment ; Fisheries ; Management ; Pollution ; BMPs ; dissolved oxygen ; mercury ; Suisun Marsh ; managed wetlands ; best management practices ; methyl mercury ; hydrology ; tidal water quality ; Wetlands and Water Resources ; Bachand and Associates ; Suisun Resource Conservation District ; California Department of Fish and Game ; California Department of Water Resources ; University of California Davis ; U.S. Geological Survey
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 353
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  • 5
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    Fütterversuche an Süßwasserfischen unter Schwermetallzusatz (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/6215 | 1240 | 2012-11-14 15:48:42 | 6215 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-07-13
    Description: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Keywords: Aquaculture ; carry over ; heavy metals ; freshwater fish ; feeding experiments ; cadmium ; mercury ; carp ; Cyprinus carpio ; toxicity
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 31-32
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  • 6
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    Acute toxicity of copper, zinc and mercury on intertidal gastropods of Mumbai coast (2021)
    In:  http://aquaticcommons.org/id/eprint/17418 | 12051 | 2015-07-05 07:57:01 | 17418 | Indian Fisheries Association
    Details
    Publication Date: 2021-07-12
    Description: The acute toxicity test conducted by static bioassay techniques have revealed that among selected heavy metals, copper is more toxic than zinc and mercury to Planaxis sulcatus and Trochus radiatus. The natural availability of heavy metals in the surrounding environment of these organisms is found to be deciding factor for their toxicity. Natural habitat of the animal also contributes to the sensitivity of a particular animal to the heavy metals tested. In addition the tendency of the animal to overcome the adverse conditions in their surrounding also plays a significant role in toxicity of pollutants.
    Keywords: Pollution ; zinc ; mercury ; pollution effects ; marine molluscs ; copper ; toxicity ; intertidal environment ; Planaxis sulcatus ; Nerita oryzarum ; Trochus radiatus ; Mumbai ; Maharashtra ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 101-106
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  • 7
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    Filtration in some tropical intertidal bivalves exposed to mercury and cadmium mixtures (2021)
    In:  http://aquaticcommons.org/id/eprint/18558 | 12051 | 2015-11-04 15:16:46 | 18558 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-10
    Description: Three species of intertidal filter feeding bivalves (Modiolus carvalhoi, Modiolus sp. and Donax spiculum) exposed to mercury and cadmium filtered significantly less volume of water under individual metal and metal mixture stress. Mercury and cadmium in mixtures interacted additively and more than additively (Synergism) in depressing the filtration rate of the bivalves.
    Keywords: Chemistry ; Pollution ; filtration ; cadmium ; toxicity tests ; filter feeders ; heavy metals ; mercury ; Modiolus curvalhoi ; Donax spiculum
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 204-210
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  • 8
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    Assessment of the essential elements and heavy metals content of the muscle of kutum (Rutilus frisii kutum) from the south Caspian Sea and potential risk assessment (2021)
    In:  http://aquaticcommons.org/id/eprint/22807 | 18721 | 2018-05-23 22:02:04 | 22807 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-10
    Description: Concentrations of heavy metals were determined in muscles of Kutum (Rutilus frisii kutum) collected from the central part of the southern end of the Caspian Sea during February 2011. Except for silver (Ag) and nickel (Ni) which were below the limits of detection, the average levels of arsenic (As), cadmium (Cd), copper [sic] (Co), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), lead (Pb), selenium (Se) and zinc (Zn) were 1.61, 0.025, 0.038, 0.176, 1.32, 5.83, 0.238, 0.869, 1.93 and 8.05 mg kg^-1 wet weight, respectively. Although the maximum levels of Pb were higher than that recommended in some international guidelines (i.e. WHO 〈1.5mg kg^-1), the estimated daily intakes of all metals were below the acceptable daily intake set by the joint FAO/WHO expert committee on food additives, and the hazard quotient values showed that there is no risk for consumptions of Kutum in reasonable amounts for consumers.
    Keywords: Chemistry ; Fisheries ; Health ; Pollution ; Trace elements ; Kutum (Rutilus frisii kutum) ; Risk assessment ; Caspian Sea ; Fish processing ; Iran ; heavy metals ; muscle ; silver ; nickel ; arsenic ; cadmium ; copper ; chromium ; iron ; manganese ; lead ; selenium ; zinc
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 660-671
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  • 9
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    Neue Erkenntnisse über die Kontamination von Fischen der südlichen Nordsee mit Cadmium, Blei und Quecksilber (2021)
    In:  foe@vti.bund.de | http://aquaticcommons.org/id/eprint/5452 | 1240 | 2012-11-11 19:26:55 | 5452 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-07-10
    Description: Johann Heinrich von Thunen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung – Information on Fishery research in 2010
    Keywords: Biology ; Chemistry ; Ecology ; Environment ; contamination ; fish ; heavy metals ; North Sea ; bioaccunulation ; lead ; cadmium ; mercury ; mass transfer
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 139-146
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  • 10
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    Determination of acute mercury toxicity to developing stages of Cyprinus carpio and Cirrhinus mrigala (2021)
    In:  http://aquaticcommons.org/id/eprint/18660 | 12051 | 2015-11-10 07:17:29 | 18660 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-10
    Description: Toxicity of inorganic mercury to different life history stages of fresh water fishes, Cyprinus carpio and Cirrhinus mrigala were demonstrated by static bioassays. 48 and 94% of egg hatching occurred in controls at 72 and 24h of experimentation in C. carpio and C. mrigala respectively. While fish eggs in water containing mercuric chloride showed delayed development as compared to the control. LC50, LC100 and safe concentrations of hatchling, fry and fingerling were calculated. Hatchling and fry were observed to be more susceptible as compared to fingerlings of C. carpio and C. mrigala.
    Keywords: Aquaculture ; Pollution ; mercury ; toxicity tests ; Cirrhinus mrigala ; Cyprinus carpio
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 29-31
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