NDLI: Effects of waterborne silver in a marine teleost, the gulf toadfish (Opsanus beta): effects of feeding and chronic exposure on bioaccumulation and physiological responses.

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Effects of waterborne silver in a marine teleost, the gulf toadfish (Opsanus beta): effects of feeding and chronic exposure on bioaccumulation and physiological responses.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wood, Chris M. Grosell, Martin McDonald, M. Danielle Playle, Richard C. Walsh, Patrick J.
Description	Country affiliation: Canada Author Affiliation: Wood CM ( Department of Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario, Canada. woodcm@mcmaster.ca)
Abstract	Marine teleosts drink seawater, and the digestive tract is a key organ of osmoregulation. The gastro-intestinal tract therefore offers a second site for the potential uptake and toxicity of waterborne metals, but how these processes might interact with the digestive functions of the tract has not been investigated previously. We therefore compared the responses of adult gulf toadfish (Opsanus beta, collected from the wild) to a chronic 22d exposure to waterborne Ag (nominally 200 microg L(-1)=1.85 micromol L(-1)), in the presence or absence of daily satiation feeding (shrimp). Ag exposure did not affect voluntary feeding rate. Feeding reduced the net whole body accumulation of Ag by >50%, with reductions in liver concentrations (high) and white muscle concentrations (relatively low) playing the largest quantitative roles. Feeding also protected against Ag buildup in the esophagus-stomach and kidney, and increased biliary and urinary Ag concentrations. The gill was the only tissue to show the opposite response. Although terminal plasma Na(+), Cl(-), and Mg(2+) concentrations were unaffected, there were complex interactive effects on osmoregulatory functions of the gastro-intestinal tract, including drinking rate, gut fluid volumes, and intestinal base secretion rates. At the end of the exposure, the plasma clearance kinetics of an arterially injected tracer dose of (110 m)Ag were faster in toadfish that had been chronically exposed to waterborne Ag, and (110 m)Ag accumulation in their red blood cells was reduced. After 32 h, higher amounts of (110 m)Ag were found in bile and urine, but lower amounts in the intestine of the Ag-exposed toadfish; there were no other differences in tissue-specific distribution. The results suggest that feeding reduces waterborne Ag uptake through the digestive tract and alters physiological responses, while chronic exposure enhances regulatory functions. The time-dependent actions of the liver in Ag scavenging and detoxification are highlighted.
File Format	HTM / HTML
ISSN	0166445X
Issue Number	2
Volume Number	99
e-ISSN	18791514
Journal	Aquatic Toxicology
Language	English
Publisher	Elsevier
Publisher Date	2010-08-15
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Toxicology Batrachoidiformes Physiology Environmental Exposure Silver Pharmacokinetics Toxicity Water Pollutants, Chemical Animals Drinking Drug Effects Eating Fasting Intestines Liver Metabolism Random Allocation Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Aquatic Science

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Immunohistochemical localization of urea and ammonia transporters in two confamilial fish species, the ureotelic gulf toadfish (Opsanus beta) and the ammoniotelic plainfin midshipman (Porichthys notatus)

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Effects of waterborne silver in a marine teleost, the gulf toadfish (Opsanus beta): effects of feeding and chronic exposure on bioaccumulation and physiological responses.

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