Tolerance of whitefish (Coregonus lavaretus) early life stages to manganese sulfate is affected by the parents (original) (raw)
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Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS), 2015
Manganese (Mn) is an essential nutrient that can be toxic in excess concentrations, especially during early development stages. The mechanisms of Mn toxicity is still unclear, and little information is available regarding the role of Mn speciation and fractionation in toxicology. We aimed to investigate the toxic effects of several chemical forms of Mn in embryos of Danio rerio exposed during different development stages, between 2 and 122h post fertilization. We found a stage-specific increase of lethality associated with hatching and removal of the chorion. Mn(II), ([Mn(H2O)6](2+)) appeared to be the most toxic species to embryos exposed for 48h, and Mn(II) citrate was most toxic to embryos exposed for 72 and/or 120h. Manganese toxicity was associated with calcium disruption, manganese speciation and metal fractionation, including bioaccumulation in tissue, granule fractions, organelles and denaturated proteins.
Ecotoxicology (London, England), 2018
Manganese and iron were found at high concentrations (3.61 mg/L and 19.8 mg/L, respectively) in the water of the Rio Doce after the dams of Fundão and Santarém broke in Mariana/MG (Brazil). These same metals were found in fish and crustacean muscle (15 mg/kg and 8 mg/kg wet weight, respectively) in the specimens collected near the Rio Doce's outfall. Due to the variation in Mn concentration found in the lower Rio Doce, this study aimed to determine the effects of Mn in Oreochromis niloticus, at the concentrations allowed by CONAMA, and in concentrations found in the Rio Doce after the dams broke. The animals were exposed to the following dissolved concentrations: control group (0.0 mg/L), 0.2; 1.5 and 2.9 mg/L manganese for 96 h. In addition, a positive control was conducted, injecting intraperitoneally with cyclophosphamide (at 25 mg/kg). These exposures caused significant erythrocyte micronucleus formation in the organisms exposed to the highest concentration, as well a signif...
Evaluation of Reversal and Transposition Generational Damages Caused by Manganese (II) in Zebrafish
2021
Although manganese (Mn) is a common water pollutant, little is known about the potential for the trans-generational transfer of biological effects in fish exposed to low concentrations in aquatic organisms, or the persistence of these effects. The aim was to identify when biological effects were firstly observed in the brain, liver and intestinal tissues of zebrafish exposed to environmentally relevant concentrations of Mn and whether these effects were subject to reversal when exposures ceased. We also aimed to assess whether biological effects observed in zebrafish exposed to Mn for 21-days were also observed in the early life stages of the F1 generation. Behavioral changes were observed in the animals exposed for 14 days to MnCl 2 (4.0 mg L -1 ). There was also an oscillation in the mitochondrial activity and TUNEL positive cells in the telencephalon of exposed fish from all treatments. These results indicated that brain neurogenesis in zebrafish occurred with greater magnitude a...
Ife Journal of Science, 2020
This study investigated the acute toxicity and behavioural response of African catfish (Clarias gariepinus) to manganese chloride (MnCl ) solution. One hundred (100) pieces of juvenile Clarias gariepinus were acclimatized 2 for 14 days in ten (10) plastic bowls containing 25 L of water each. The acute-toxicity of manganese chloride, LC and sub chronic exposure (28 days) were investigated. For sub-lethal exposure; fifty pieces of C. gariepinus 50 were divided into five groups of ten in bowls labelled (A to E). The fish in groups (A to D) were exposed to manganese chloride solutions at: 68.5, 137, 205.5 and 274 mg/L respectively while group G served as the control. On day 28, the exposed fish were sacrificed; blood, muscle, liver, and gills were collected for haematological and histological studies. The activities of the superoxide dismutase (SOD) and glutathione-Stransferase (GST) were determined using standard methods. The manganese concentrations in the liver, gills and muscle ti...
2015
The pollution of aquatic ecosystems may affect natural reproduction of fish populations by decreasing the fertilization efficiency. Among the various sources of pollution, heavy metals are important group, being found in both freshwater and marine environment. The present study investigated changes of sperm characteristics of Caspimyzon wagneri when exposed to Manganese (Mn). Spermatozoids were exposed to 0 (control), 0.01, 0.1, 1, 10, 100 and 1000 mg l-1 of Mn, duration of sperm motility and percent of motile sperms were measured using a light microscope and digital camera as a semi-quantitative method. Total duration of spermatozoids motility decreased with increase of Mn concentration in all treatments. This study indicated that Mn could seriously affect the reproductive success of the Caspian lamprey in a polluted environment through decreasing the duration of spermatozoid motility and possibly fertilization and hatching rates. Hence, contact to this metal could decrease the sur...
PloS one, 2015
Metal contamination represents one of the major sources of pollution in marine environments. In this study we investigated the short-term effects of ecologically relevant cadmium and manganese concentrations (10-6 and 3.6 x 10-5 M, respectively) on females of the sea urchin Paracentrotus lividus and their progeny, reared in the absence or presence of the metal. Cadmium is a well-known heavy metal, whereas manganese represents a potential emerging contaminant, resulting from an increased production of manganese-containing compounds. The effects of these agents were examined on both P. lividus adults and their offspring following reproductive state, morphology of embryos, nitric oxide (NO) production and differential gene expression. Here, we demonstrated that both metals differentially impaired the fertilization processes of the treated female sea urchins, causing modifications in the reproductive state and also affecting NO production in the ovaries. A detailed analysis of the proge...
Effect of Manganese on haematological parameters of fish, Garra gotyla gotyla
Journal of entomology and zoology studies, 2014
In the present study, an attempt has been made to study the effect of heavy metal Manganese (MnSO4) on the haematological parameters of fish Garra gotyla gotyla for 9 weeks experimental duration. 96 hours LC50 value of Manganese for G. gotyla gotyla was found to be 3.2 mg/l and three concentrations viz. 20%, 40% and 60% of LC50 were employed during experimental period. The parameters evaluated include total erythrocyte count (TEC), haemoglobin (Hb), haematocrit (Hct), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration (MCHC), total leucocyte count (TLC) and differential leucocyte count (DLC). Compared to control groups, TEC, Hb and Hct were found to exhibit significant decline whereas MCV and MCH exhibited overall increase in all concentration groups while MCHC contrarily exhibited fluctuating pattern. TLC depicted significant increase in all fishes following exposure to Manganese. DLC was observed to register an increase in...