Recursos de colección

Aquatic Commons (41.069 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Pollution

Mostrando recursos 1 - 20 de 133

  1. Assessment of cadmium and lead in the water and trout fish (Salmo trutta) of Zayandehroud River, a case study of Zarinshahr rice farms, Isfahan

    Moradi, S.; Nowzari, H.; Farhadian, M.
    This study aimed to investigate the concentrations of two heavy metals, lead and cadmium, in the water of Zayandehroud River which is surrounded by Zarinshahr rice farms. Water was sampled from a depth of 30 cm during June, July and August 2015, i.e. during the process of planting, growing and after harvesting, in three stations. Water was collected from three points; 20m before the farms, beside the farms and 100m after the farms. Three water samples and one trout fish (Salmo trutta) sample were collected each month and the concentrations of lead and cadmium were measured in the kidney, liver...

  2. The hematological improvement of rainbow trout (Oncorhynchus mykiss) during dietary supplementation with vitamin C after exposure to zinc nano-particles

    Chahardeh Baladehi, E.; Hedayati, S.A.A.; Kolangi Miandare, H.; Bagheri, T.
    The aim of this study was to examine the adverse effects of zinc nanoparticles on hematological indices of trout and investigate the improvement of these indices after vitamin C treatments. This study assesses the protective role of vitamin C in fish exposed to ZnO NPs. Two concentrations of ZnO-NPs (40 and 80 mg L^-1) and two doses of vitamin C (400 and 800 mg per kg of feed) were used to treat 162 specimens of Oncorhynchus mykiss. No mortality was observed during the test. After 5 and 10 days of exposure, hematological data were analyzed according to routine clinical methods....

  3. Diagnosis of endosulfan induced DNA damage in rohu (Labeo rohita, Hamilton) using comet assay

    Ullah, S.; Hasan, Z.; Zorriehzahra, M.J.; Ahmad, S.
    Use of different pesticides in the agriculture sector, in order to boost crop yield within a short time period and low labor, has been tremendously increased since the last decade. Pesticide use has elevated crop yield but has produced a number of pronounced problems regarding environmental and health safety. The continuously deteriorating toxicological effects of these pesticides are not only hazardous to humans and land animals but also to economically important aquatic organisms such as fish. One of these extensively used pesticides is an organochlorine insecticide, endosulfan. Experiments conducted in the past have shown the deleterious effects of endosulfan on...

  4. Biomonitoring of trace metal bioavailability in the barnacle Amphibalanus improvisus along the Iranian coast of the Caspian Sea

    Nasrolahi, A.; Smith, B.D.; Ehsanpour, M.; Afkhami, M.; Rainbow, P.S.
    The fouling barnacle Amphibalanus improvisus is a cosmopolitan biomonitor of trace metal bioavailability in coastal waters of reduced salinity such as estuaries or the Baltic Sea. Bioavailability of Ag, As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn to A. improvisus was investigated in July 2014 at 15 sites along the Iranian coast of the understudied, yet biologically unique, Caspian Sea. In general, the bioavailability of these toxic metals in the water column, as biomonitored by the barnacle, was within the typical ranges expected from data available in the literature. Thus, there were no major environmental concerns...

  5. Environmental effects of the cold water fish farms effluents on the water quality of Gamasyab River as their main source of water supply in the west of Iran

    Danesh pajooh, R.; Reyahi Khoram, M.; Cheraghi, M.; Mohamad Poor Roodposhty, G.A.
    Rainbow trout (Oncorhynchus mykiss) is one of the most-widely cultivated cold fresh water fish in the world. Gamasyab River, with a length of about 200 Km, is one of the longest rivers of Iran. The aim of this research is to determine the effects of trout farm effluents on this river water. From a total of 24 trout farms in the area, four farms were randomly selected and three sampling stations were chosen at each selected farm. Measured water quality parameters were temperature (T), total suspended solids (TSS), total dissolved solid (TDS), dissolved oxygen (DO), pH, five-day biochemical oxygen demand...

  6. Metal bioaccumulation in representative organisms from different trophic levels of the Caspian Sea

    Mirzajani, A.R.; Hamidian, A.H.; Karami, M.
    The bioaccumulations of metals Cu, Cd, Ni, Cr, Co, Mn, Zn and Fe were measured in bivalves, Cerastoderma glaucum, and four species of fishes including Alburnus chalcoides, Liza aurata, Rutilus frisii and Sander lucioperca from various trophic levels of the Caspian food web. The concentrations of Cd, Cr, Co and Ni in most samples of fish were below the detection limits; while the concentrations were detected in most samples of bivalve C. glaucum. The stable nitrogen isotope ratios varied among the samples from C. glaucum (δ^15N=3.5 ‰) to S. lucioperca (δ^15N=13.1‰). Among the four fish species, while the highest concentrations...

  7. Phytoplankton of Aras dam reservoir (Iran): an attempt to assess water quality

    Mohebbi, F.; Riahi, H.; Sheidaei, M.; Shariatmadari, Z.
    The Aras reservoir, located in the north-west of Iran, plays an important role in fisheries, drinking and agricultural water supplies and recreational activities in the region. This study was performed to characterize the seasonal fluctuations of phytoplankton communities and their relationship with environmental factors in the Aras reservoir from August 2013 to May 2014. Sampling was carried out seasonally from 5 sampling locations. In each location three samples were taken for phytoplankton identification and enumeration, chemical analysis and chlorophyll a determination. In total, 72 species belonging to 5 divisions were determined. Cyanobacteria contained the highest density (74%) during the study...

  8. Distribution pattern of heavy metals in the surficial sediment of Gorgan Bay (South Caspian Sea, Iran)

    Ghorbanzadeh Zaferani, S.Gh.; Machinchian Moradi, A.; Mousavi Nadushan, R.; Sari, A.R.; Fatemi, S.M.R.
    The Gorgan Bay is an important ecosystem receiving discharge from their tributaries. In this study, concentration of Pb, Zn, Ni, Fe, Al, Cu and As was seasonally determined at 22 sampling points during 2012-2013. Sediment samples were collected using a Van Veen grab. The levels of heavy metals were determined by ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometry) and AAS (Atomic Absorption Spectrophotometer). The percentages of sand, silt, clay and TOM (Total Organic Matter) in the sediment samples were determined (44.4± 15, 53.4 ± 14, and 2.2± 2.2 and 7.2% ± 1.6, respectively). The results showed that range of Al,...

  9. Off-shore disposal of chemical agents and weapons conducted by the United States

    Compilation of 73 disposal sites in the Atlantic Ocean, Pacific Ocean, Mediterranean Sea, Indian Ocean, and U.S. rivers and lakes, 1918-1970.

  10. Haemato-immunological responses to diazinon chronic toxicity in Barbus sharpeyi

    Alishahi, M.; Mohammadi, A.; Mesbah, M.; Razi Jalali, M.
    The present research aimed to determine acute toxicity and evaluate the effect of sub-lethal concentrations of diazinon on some haematological and immunological parameters of Barbus sharpeyi by the Organization for Economic Cooperation and Development methods. Juvenile B. sharpeyi were exposed to 0, 5%, 10% and 25% 96h LC50 concentrations of diazinon for 21 days. Blood samples were taken after 7, 14 and 21 days of exposure to diazinon. Haematological and biochemical parameters including: RBC, Hb, PCV and WBC, as well as serum enzymes were evaluated. Immunological indices and resistance against bacterial infection, were determined. Results showed that 96h LC50 of...

  11. Study of the heavy metals (Cd and Pb) content in the tissues of rainbow trouts from Hamedan coldwater fish farms

    Reyahi-Khoram, M.; Setayesh-Shiri, F.; Cheraghi, M.
    The aim of this research was to determine the concentration of cadmium (Cd) and lead (Pb) in the muscle and liver tissues of rainbow trout (Oncorhynchus mykiss) in Hamedan Province (west of Iran) cold water fish farms, and compare the results with the FAO/WHO guidelines. Heavy metal concentrations were determined from the three randomly selected fish farms by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) method. Concentration of heavy metals were detected to be high in rainbow trout during dry season. Concentration of Cd and Pb in the muscle and liver tissues were 3.67µg/kg and 12.82µg/kg, respectively. However concentrations of...

  12. Short communication: Study on heavy metals (Chromium, Cadmium, Cobalt and Lead) concentration in three pelagic species of kilka (Genus Clupeonella) in the southern Caspian Sea

    Taghavi Jelodar, H.; Fazli, H.; Salman Mahiny, A.
    Environmental pollution by heavy metals has been a matter of growing concern over the last decades. Heavy metals are toxic and tend to accumulate in living organisms. In many studies, fish has been used as a sampling item to monitor the quality of ecosystems because of two reasons: 1- Fish bio-concentrate and integrate contaminant load both in time and space leading to more representative results compared to water samples, and 2- Fish represent the bio-available fraction of environmental contaminants, unlike water and sediment samples. On the other hand, humans consume fish species which makes attention to these fauna even more...

  13. Water quality assessment in Choghakhor Wetland using water quality index (WQI)

    Fathi, P.; Ebrahimi, E.; Mirghafarry, M.; Esmaeili Ofogh, A.
    The Choghakhor International Wetland plays an important role in preserving and protection of part of the plant and animal species in the Iranian plateau. Since the water of this wetland is utilized for different human purposes, complete periodic chemical and physical quality assessment of its water seems necessary. Water quality index (WQI) was calculated using the following eleven parameters: Nitrate, Nitrite, Ammonium, Alkalinity, Hardness, Turbidity, Conductivity, Dissolved Oxygen, Total Dissolved Solid, pH and Biochemical Oxygen Demand (BOD5). For this purpose, the relative weight assigned to each parameter ranged from 1 to 4 based on the importance of the parameter for...

  14. Influence of trout farm effluents on water quality parameters and benthic macroinvertebrates

    Mesgaran Karimi, J.; Azari Takami, G.; Khara, H.; Abbaspour, R.
    The aim of this study was to assess the influence of trout farm effluents on water quality parameters in the Dohezar Stream. In this study two trout farms and 7 stations were selected and physiochemical of water, including air and water temperatures, dissolved oxygen concentration (DO), pH, electrical conductivity (EC), water flow and biochemical oxygen demand (BOD) were measured every 30 days for one year. A combined total of 60 benthic macroinvertebrate taxa were collected from the seven sites of the stream. The results showed that trout farms had a significant impact on EC, pH, water flow and BOD in...

  15. Perception of fish farmers to climate change and adoption strategies in Oyo State, Nigeria

    Fregene, B.T.; Ogunika, O.F.
    The study identified the perception of fish farmers in Oyo State to climate change as well as the adaptation strategies used by them. A two stage stratified sampling method was used to select 156 fish farmers from the four Agriculture Development Programme (ADP) zones and eight local government areas (LGAs) in Oyo State. Structured questionnaires were administered to the fish farmers. Descriptive statistic and linear regression were used to analyses data collected. The result shows that majority were males (84.0%\}, dominant age (66.0%) were within the age bracket of 46-65 years. The farmers are literate as 46.8% have attained secondary...

  16. Communication strategies / matrix for stakeholders' adaptation to climate change issues in Nigeria

    Yarhere, M.
    Over the years, man has exploited the ocean and its resources for sustainable livelihood. Man's indigenous and traditional knowledge has been the mainstay and guidance in exploiting the ocean and coastal resources. However, as industrialization and other climate conditions set in to alter or modify the productivity of the ecosystem, there has been a lot of concern by international, regional and local authorities to continuously study the prevalence of these factors and triggers off these climatic changes and their impacts on livelihood of fisherfolks at the industrial or artisanal level of fishing and other fisheries activities like fish farming and...

  17. Fisher folk's response to climate change in New Bussa and its environs of Kainji Lake Basin, Nigeria

    Oluwasegun, T.O.; Landu, E.J.; Oluwasegun, O.M.
    The study examined fisher folk responses to climate change in Kainji lake basin. The sample comprises of fisher folks within and New Bussa. Eighty questionnaires were administered to obtain the primary data and analysed using descriptive and inferential statistical tools. The results revealed that majority (70%) of the respondent were male, however (61.2%) of them had tertiary education. Majority (60%) of the respondents were aware of changes in climate in the area. Majority (65%) and (55%) of the respondents were involved in incidence of deforestation and charcoal production respectively. In conclusion, it was discovered that little knowledge about climate change...

  18. The effect of feeding regime and rate on the growth of Clarias gariepinus (Burchell, 1822) fingerlings fed with artificial feed

    Ewutanure, S.J.
    Fish growth is a function of adequate supply of feed in the right quantity and time. The effect of feeding rate on the growth of Clarias gariepinus (Burchell, 1822) was studied for a period of 22 weeks. The fish were fed at the same percentage body weight throughout the study period and a bi-weekly weight gain was measured. Water quality parameters were also monitored. There was a significant increase in weight gain in daily feeding regime than in the ones in two days feeding regime. The increase in weight for the daily feeding regime was visible as from the 8th...

  19. Short communication: Using polychaetes as an assessment tool for health status of Jafari Creek, north-west of the Persian Gulf

    Mooraki, N.
    Marine ecosystems and their adjacent coastal habitats, especially estuaries are important because of maintaining the coastal biota, including a diverse array of organisms. However, these ecosystems are being impacted by the anthropogenic activities through urbanization and industrialization developments. For evaluating the degree of alteration occurring in these valuable ecosystems, scientists have conducted several methodologies based on chemical assays (i.e. directly measured abiotic parameters of the environment) and use of ecological indices. ... In this regard, the present paper was prepared to evaluate the health status of Jafari Creek using polychaetes as indicators and to compare the results with the previous...

  20. Determination of cadmium accumulation capabilities of aquatic macrophytes Ceratophyllum demersum, Bacopa monnieri and Rotala rotundifolia

    Dogan, M.; Akgul, H.; Inan, O.G.; Zeren, H.
    In the present study, cadmium (Cd) accumulation capabilities of aquatic macrophytes Ceratophyllum demersum, Bacopa monnieri and Rotala rotundifolia were determined after treating both individual and triple macrophytes. The macrophytes were treated with Cd at 0, 0.1, 1 and 10 mg/L concentrations in a controlled chamber for 12-days. Cadmium accumulations increased with increasing Cd concentrations in all macrophytes. Bioconcentration factor (BCF), which indicates the efficiency of the macrophyte to accumulate Cd, decreased with increased external Cd concentrations. When compared to single macrophyte applications, reductions were observed in Cd accumulation of the combined macrophyte treatments. The maximum Cd accumulation was recorded in...

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