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Aquatic Toxicology

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https://www.readbyqxmd.com/read/28437657/toxicity-and-bioaccumulation-of-three-hexabromocyclododecane-diastereoisomers-in-the-marine-copepod-tigriopus-japonicas
#1
Haizheng Hong, Dongmei Lv, Wanxin Liu, Lingming Huang, Leyun Chen, Rong Shen, Dalin Shi
The three major hexabromocyclododecane (HBCD) diastereoisomers, i.e. α-, β- and γ-HBCD, have distinct physical and chemical properties that may potentially result in different levels of bioaccumulation and toxicity in aquatic organisms. To assess the impact of diastereomeric variation in HBCDs, the marine copepod Tigriopus japonicus was exposed to α-, β- and γ-HBCD in isolation. Results showed that all the three diastereoisomers had a similar potency to cause growth delay in T. japonicas. Variation was observed in the overall survival rate with exposure to α- and β-HBCD, and this resulted in significantly higher lethal toxicity in T...
April 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28410472/histological-alterations-in-gills-of-macrobrachium-amazonicum-juveniles-exposed-to-ammonia-and-nitrite
#2
Fabrício Martins Dutra, Milton Rönnau, Dircelei Sponchiado, Sandra Carla Forneck, Carolina Arruda Freire, Eduardo Luis Cupertino Ballester
Aquaculture has shown great growth in the last decades. Due to the restrictions on water use, production systems are becoming increasingly more intensive, raising concerns about the production water quality. Macrobrachium amazonicum is among the freshwater prawn species with favorable characteristics for production and possibility of intensification. Nitrogen compounds such as ammonia and nitrite affect the health of aquatic organisms since they quickly reach toxic concentrations. These compounds can also cause damage to the gill structure, leading to hypoxia in tissues, affecting acid-base balance, osmoregulation (salt absorption) and ammonia excretion, decreasing the immune capacity of the animal and, in extreme cases, cause death...
April 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28415051/cross-interference-of-two-model-peroxisome-proliferators-in-peroxisomal-and-estrogenic-pathways-in-brown-trout-hepatocytes
#3
Tânia Vieira Madureira, Ivone Pinheiro, Fernanda Malhão, Célia Lopes, Ralph Urbatzka, L Filipe C Castro, Eduardo Rocha
Peroxisome proliferators cause species-specific effects, which seem to be primarily transduced by peroxisome proliferator-activated receptor alpha (PPARα). Interestingly, PPARα has a close interrelationship with estrogenic signaling, and this latter has already been promptly activated in brown trout primary hepatocytes. Thus, and further exploring this model, we assess here the reactivity of two PPARα agonists in direct peroxisomal routes and, in parallel the cross-interferences in estrogen receptor (ER) mediated paths...
April 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28395197/sustained-impairment-of-respiratory-function-and-swim-performance-following-acute-oil-exposure-in-a-coastal-marine-fish
#4
J L Johansen, A J Esbaugh
Acute exposure to crude oil polycyclic aromatic hydrocarbons (PAH) can severely impair cardiorespiratory function and swim performance of larval fish; however, the effects of acute oil exposure on later life stages and the capacity for subsequent recovery is less clear. Red drum (Sciaenops ocellatus) is an economically important apex predator native to the Gulf of Mexico, which was directly exposed to the 2010 Deep Water Horizon (DWH) oil spill. Here we examine impact and recovery of young adult red drum from exposure to concentrations of 0, 4...
April 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28411469/primary-hepatocytes-from-arctic-char-salvelinus-alpinus-as-a-relevant-arctic-in-vitro-model-for-screening-contaminants-and-environmental-extracts
#5
Karina Petersen, Maria T Hultman, Knut Erik Tollefsen
Contaminants find their way to the Arctic through long-range atmospheric transport, transport via ocean currents, and through increased anthropogenic activity. Some of the typical pollutants reaching the Arctic (PAHs, PCBs) are known to induce cytochrome P450 1a (CYP1A) protein expression and ethoxyresorufin-O-deethylase (EROD) activity through the aryl hydrocarbon receptor (AhR). In addition, some endocrine disrupting chemicals (EDCs) such as estrogen mimics (xenoestrogens) have been documented in Arctic areas and they may interfere with natural sexual development and reproduction...
April 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28399480/acute-toxication-of-deltamethrin-results-in-activation-of-inos-8-ohdg-and-up-regulation-of-caspase-3-inos-gene-expression-in-common-carp-cyprinus-carpio-l
#6
Harun Arslan, Serdar Altun, Selçuk Özdemir
Deltamethrin is a widely used synthetic pyrethroid pesticide that protects agricultural yields, including crops, fruits, and vegetables from insect-pests. It is known that deltamethrin toxication leads to metabolic disorders and has detrimental effects on the brain and liver in different organisms. However, the harmful effects of deltamethrin toxication on aquatic animals remain unclear. In the present study, we aimed to evaluate the adverse effects of deltamethrin toxication by performing a histopathological examination, an immunofluorescence assay, and a qRT-PCR on common carp...
April 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28411468/nine-co-localized-cytochrome-p450-genes-of-the-cyp2n-cyp2ad-and-cyp2p-gene-families-in-the-mangrove-killifish-kryptolebias-marmoratus-genome-identification-and-expression-in-response-to-b-%C3%AE-p-bpa-op-and-np
#7
Jayesh Puthumana, Bo-Mi Kim, Chang-Bum Jeong, Duck-Hyun Kim, Hye-Min Kang, Jee-Hyun Jung, Il-Chan Kim, Un-Ki Hwang, Jae-Seong Lee
The CYP2 genes are the largest and most diverse cytochrome P450 (CYP) subfamily in vertebrates. We have identified nine co-localized CYP2 genes (∼55kb) in a new cluster in the genome of the highly resilient ecotoxicological fish model Kryptolebias marmoratus. Molecular characterization, temporal and tissue-specific expression pattern, and response to xenobiotics of these genes were examined. The CYP2 gene clusters were characterized and designated CYP2N22-23, CYP2AD12, and CYP2P16-20. Gene synteny analysis confirmed that the cluster in K...
March 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28388481/membrane-lipid-profiles-of-coral-responded-to-zinc-oxide-nanoparticle-induced-perturbations-on-the-cellular-membrane
#8
Chuan-Ho Tang, Ching-Yu Lin, Shu-Hui Lee, Wei-Hsien Wang
Zinc oxide nanoparticles (nZnOs) released from popular sunscreens used during marine recreation apparently endanger corals; however, the known biological effects are very limited. Membrane lipids constitute the basic structural element to create cell a dynamic structure according to the circumstance. Nano-specific effects have been shown to mechanically perturb the physical state of the lipid membrane, and the cells accommodating the actions of nZnOs can be involved in the alteration of the membrane lipid composition...
March 31, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28410471/toxicity-of-titanium-dioxide-nanoparticles-to-chlorella-vulgaris-beyerinck-beijerinck-1890-trebouxiophyceae-chlorophyta-under-changing-nitrogen-conditions
#9
Suleiman Dauda, Mathias Ahii Chia, Sunday Paul Bako
The broad application of titanium dioxide nanoparticles (n-TiO2) in many consumer products has resulted in the release of substantial quantities into aquatic systems. While n-TiO2 have been shown to induce some unexpected toxic effects on aquatic organisms such as microalgae, the influence of changing nutrient conditions on the toxicity of the metal has not been investigated. We evaluated the toxicity of n-TiO2 to Chlorella vulgaris under varying nitrogen conditions. Limited nitrogen (2.2μM) decreased growth and biomass (dry weight and pigment content), while lipid peroxidation (malondialdehyde content), glutathione S-transferase activity (GST) and peroxidase (POD) activity were increased...
March 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28407513/effects-of-cyanobacteria-synechocystis-spp-in-the-host-parasite-model-crassostrea-gasar-perkinsus-marinus
#10
Fernando Ramos Queiroga, Luis Fernando Marques-Santos, Hélène Hégaret, Roberto Sassi, Natanael Dantas Farias, Lucas Nunes Santana, Patricia Mirella da Silva
Perkinsosis is a disease caused by protozoan parasites from the Perkinsus genus. In Brazil, two species, P. beihaiensis and P. marinus, are frequently found infecting native oysters (Crassostrea gasar and C. rhizophorae) from cultured and wild populations in several states of the Northeast region. The impacts of this disease in bivalves from Brazil, as well as the interactions with environmental factors, are poorly studied. In the present work, we evaluated the in vitro effects of the cyanobacteria Synechocystis spp...
March 27, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28411467/different-transcriptomic-responses-of-two-marine-copepods-tigriopus-japonicus-and-pseudodiaptomus-annandalei-to-a-low-dose-of-mercury-chloride-hgcl2
#11
Minghua Wang, Chang-Bum Jeong, Yan Li, Jae-Seong Lee
Mercury (Hg) pollution is a ubiquitous and serious concern in marine environments, but the response mechanisms of marine animals to Hg pollution (i.e., toxicity/tolerance) are poorly understood. To compare the global responses of two marine copepods (Tigriopus japonicus and Pseudodiaptomus annandalei), we analyzed whole transcriptomes using RNA-seq technology in response to Hg treatment (a nominal 10μg/L HgCl2 in seawater) for 5h. Hg was strikingly accumulated in both copepods under treatment. The Hg concentration in P...
March 24, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28365461/age-dependent-changes-in-sensitivity-to-a-pesticide-in-tadpoles-of-the-common-toad-bufo-bufo
#12
Zsanett Mikó, János Ujszegi, Attila Hettyey
The worldwide en masse application of pesticides and the frequently reported malign effects on several non-target organisms underpin the importance of ecotoxicological research on these anthropogenic pollutants. Previous studies showed that sensitivity to herbicides can vary widely depending on additional stress factors, on the species and even on the population investigated. However, there is little information about how sensitivity changes during ontogeny, and how the duration of exposure is linked to the magnitude of malign effects, even though this knowledge would be important for the interpretation of toxicity test results and for formulating recommendations regarding the timing of pesticide application...
March 21, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28384517/biomarker-response-and-hypothalamus-pituitary-interrenal-axis-functioning-in-arctic-charr-from-bj%C3%A3-rn%C3%A3-ya-74%C3%A2-30-%C3%A2-n-norway-with-high-levels-of-organohalogenated-compounds
#13
Even H Jørgensen, Alec G Maule, Anita Evenset, Guttorm Christensen, Jenny Bytningsvik, Marianne Frantzen, Vladimir Nikiforov, Erin Faught, Mathilakath M Vijayan
The populations of Arctic charr (Salvelinus alpinus) residing in Lake Ellasjøen at Bjørnøya Island in the Norwegian Arctic (74° 30'N, 19° 00'E) possess substantially higher levels of organohalogenated compounds (strongly dominated by polychlorinated biphenyls, PCBs) than conspecifics residing in other, proximate lakes on the island. In the present study we sampled large (<400g), immature charr from Lake Ellasjøen (high PCB levels) and Lake Laksvatn (reference lake, low PCB levels) by hook and line for an immediate blood sampling, and blood and tissue sampling after a 1h confinement stressor...
March 20, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28351760/extreme-nitrite-tolerance-in-the-clown-knifefish-chitala-ornata-is-linked-to-up-regulation-of-methaemoglobin-reductase-activity
#14
Le Thi Hong Gam, Frank Bo Jensen, Christian Damsgaard, Do Thi Thanh Huong, Nguyen Thanh Phuong, Mark Bayley
The clown knifefish is a facultative air breather, which is widely farmed in freshwater ponds in Vietnam. Here we report a very high nitrite tolerance (96h LC50 of 7.82mM) in this species and examine the effects of 1mM (LC5) and 2.5mM (LC10) ambient nitrite on haemoglobin (Hb) derivatives, electrolyte levels, acid-base status, and total body water content during 7days of exposure. Furthermore, we tested the hypothesis that erythrocyte methaemoglobin (metHb) reductase activity is upregulated by nitrite exposure...
March 19, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28371659/the-ros-mediated-pathway-coupled-with-the-mapk-p38-signalling-pathway-and-antioxidant-system-plays-roles-in-the-responses-of-mytilus-edulis-haemocytes-induced-by-bde-47
#15
Yongshun Jiang, Xuexi Tang, Bin Zhou, Tianli Sun, Hongmei Chen, Xinyu Zhao, You Wang
Our previous study found that BDE-47 could change the immune function of haemocytes in Mytilus edulis, and reactive oxygen species (ROS) might be involved in the process of physiological alteration. Here, we aimed to better understand this relationship. To accomplish this, we analysed changes in different ROS as well as various antioxidant system components. Additionally, the expression of MAPK-p38, a signalling protein regulated by ROS that helps to regulate numerous cellular processes, was also analysed. BDE-47 was given at low, medium, and high amounts...
March 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28364639/the-impacts-of-emergent-pollutants-on-ruditapes-philippinarum-biochemical-responses-to-carbon-nanoparticles-exposure
#16
Lucia De Marchi, Victor Neto, Carlo Pretti, Etelvina Figueira, Federica Chiellini, Amadeu M V M Soares, Rosa Freitas
Multi-walled carbon nanotubes (MWCNTs) are one of the most important carbon Nanoparticles (NPs). The production and use of these NPs are increasing rapidly and, therefore, the need to assess their presence in the environment and associated risks has become of prime importance. Recent studies demonstrated the impacts of different NPs on bivalves, a taxonomic group where species tolerance to anthropogenic stressors, such as pollutants, is widely variable. The Manila clam Ruditapes philippinarum is one of the most commonly used bivalve species in environmental monitoring studies and ecotoxicology tests, however, to our knowledge, no information is available on biochemical alterations on this species due to MWCNTs exposure...
March 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28363126/interaction-between-the-zebrafish-danio-rerio-organic-cation-transporter-1-oct1-and-endo-and-xenobiotics
#17
Ivan Mihaljević, Marta Popović, Roko Žaja, Nikola Maraković, Goran Šinko, Tvrtko Smital
Organic cation transporters (OCTs) serve as uptake transporters of numerous endo- and xenobiotics. They have been in the focus of medical toxicological research for more than a decade due to their key role in absorption, distribution, metabolism and excretion due to their expression on basolateral membranes of various barrier tissues. OCTs belong to the SLC22A family within the SLC (Solute carrier) protein superfamily, with three co-orthologs identified in humans (OCT1, 2 and 3), and two Oct orthologs in zebrafish (Oct1 and Oct2)...
March 18, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28343020/selenium-speciation-influences-bioaccumulation-in-limnodynastes-peronii-tadpoles
#18
C M Lanctôt, S D Melvin, T Cresswell
Despite being essential for animal health and fitness, Se has a relatively narrow range between deficiency and toxicity, and excess Se can cause a variety of adverse effects in aquatic organisms. Amphibians are particularly vulnerable to contaminants during larval aquatic life stage, because they can accumulate toxic ions through various routes including skin, gills, lungs and digestive tract. Few attempts have been made to understand the tissue-specific accumulation of trace elements, including the impacts of chemical speciation in developing amphibian larvae...
March 12, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28324829/interactive-effects-of-an-insecticide-and-a-fungicide-on-different-organism-groups-and-ecosystem-functioning-in-a-stream-detrital-food-web
#19
Mohab Dawoud, Mirco Bundschuh, Willem Goedkoop, Brendan G McKie
Freshwater ecosystems are often affected by cocktails of multiple pesticides targeting different organism groups. Prediction and evaluation of the ecosystem-level effects of these mixtures is complicated by the potential not only for interactions among the pesticides themselves, but also for the pesticides to alter biotic interactions across trophic levels. In a stream microcosm experiment, we investigated the effects of two pesticides targeting two organism groups (the insecticide lindane and fungicide azoxystrobin) on the functioning of a model stream detrital food web consisting of a detritivore (Ispoda: Asellus aquaticus) and microbes (an assemblage of fungal hyphomycetes) consuming leaf litter...
March 9, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28324828/evaluation-of-dna-damage-and-physiological-responses-in-nile-tilapia-oreochromis-niloticus-linnaeus-1758-exposed-to-sub-lethal-diclofenac-dcf
#20
Pramod K Pandey, Malachy N O Ajima, Kundan Kumar, Nalini Poojary, Saurav Kumar
The frequent bioaccumulation of pharmaceuticals in the aquatic ecosystem has raised a concern about their possible ecotoxicological consequences. DNA damage, haematological changes and activities of oxidative stress enzymes in Nile tilapia, Oreochromis niloticus in response to diclofenac (DCF) exposure were investigated for up to 60 days at the concentrations of 0.17, 0.34 and 0.68mgL(-1) in the fish liver. Evaluation of genotoxic effects of the drug in the liver, using single-cell gel electrophoresis, showed DNA damage on exposure at the concentrations of 0...
March 8, 2017: Aquatic Toxicology
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