Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/18324
Title: Acute effects of chemically dispersed crude oil on gill ion regulation, plasma ion levels and haematological parameters in tambaqui (Colossoma macropomum)
Authors: Duarte, Rafael Mendonça
Honda, Rubens Tomio
Val, Adalberto Luis
Keywords: Chloride Ion
Oil Dispersant
Petroleum
Potassium Ion
Sodium Ion
Concentration (composition)
Crude Oil
Dispersant
Dispersion
Eco-toxicology
Flux Measurement
Hematology
Permeability
Plasma
Pollution Effect
Teleost
Animals Experiment
Aquatic Environment
Blood Analysis
Cell Membrane Permeability
Colossoma Macropomum
Concentration (parameters)
Controlled Study
Eco-toxicology
Fish
Gill
Hematocrit
Hematological Parameters
Ion Transport
Nonhuman
Priority Journal
Animal
Blood Glucose
Brasil
Chlorides
Gills
Hematocrit
Hemoglobins
Lipids
Perciformes
Petroleum
Potassium
Random Allocation
Rivers
Sodium
Statistics, Nonparametric
Water Pollutants, Chemical
Amazonia
Colossoma Macropomum
Colossoma Marcopomum
Teleostei
Issue Date: 2010
metadata.dc.publisher.journal: Aquatic Toxicology
metadata.dc.relation.ispartof: Volume 97, Número 2, Pags. 134-141
Abstract: The main goal of this study was to investigate the toxicological effects of the chemical dispersant Corexit 9500, crude oil and the combination of the two components in the form of chemically dispersed crude oil (CO + DIS) on the ion regulation of the tropical fish tambaqui (Colossoma macropomum). Gill ion regulation was evaluated on the basis of unidirectional flux measurements (influx-Jin, efflux-Jout and net flux-Jnet) of Na+, Cl- and K+. Plasma ion composition, haematocrit, haemoglobin and glucose concentrations in the blood of tambaqui were determined by classical methods. The exposure of fish to chemically dispersed crude oil promoted a significant increase in Jout Na+ across the gills, which, together with the inability of fish to stimulate Na+ uptake to compensate for these losses resulted in significantly higher Jnet Na+ outward, particularly within the first 3 h of exposure. Increased outward Jnet Cl- was also seen in fish that were exposed to dispersed crude oil, whereas outward Jnet K+ was only increased at crude oil dispersed in higher concentration of Corexit 9500. Plasma Na+ and Cl- concentrations decreased between 6 and 12 h of exposure, whereas Ca2+ concentrations remained significantly lower than those of the control group over the entire experimental period. There were significant increases in plasma K+ concentrations and in the haematocrit after 6 and 24 h of exposure to dispersed crude oil, suggesting significant changes in the permeability of the erythrocytic membrane. Collectively, our results suggest that chemically dispersed crude oil promotes a more extensive impairment of gill ion regulation, in addition to changes in plasma ion levels and blood parameters, in tambaqui compared with exposure to Urucu crude oil or Corexit 9500 alone. Thus, in the event of an oil spill in Amazonian waters, the chemical dispersion of Urucu crude oil could represent a great risk to tambaqui, challenging their ability to maintain ionic and osmotic gradients in native ion-poor waters. © 2010 Elsevier B.V. All rights reserved.
URI: https://repositorio.inpa.gov.br/handle/1/18324
metadata.dc.identifier.doi: 10.1016/j.aquatox.2009.12.020
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