Acute and chronic physiological effects of silver exposure in three marine teleosts

N. A. Webb, J. R. Shaw, J. Morgan, C. Hogstrand, C. M. Wood

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

This study evaluated the physiological effects of waterborne silver (added as AgNO3) on seawater fish, using acute (48-72 h) high level exposures (250-650 μg/l Ag) on tidepool sculpins (Oligocottus maculosus), and chronic (up to 21 day) low level exposures (1.5-50 μg/l Ag) on tidepool sculpins, plainfin midshipmen (Porichthys notatus), and rainbow trout (Oncorhynchus mykiss). Sculpins were tested at different salinities. Acclimation to lower salinity (18 vs 30 ppt) led to altered physiology, with higher ammonia excretion (JAmm), lower oxygen consumption MO2, and lower branchial and intestinal Na+/K+-ATPase activities, but no difference in drinking rate. Short-term exposure to high silver levels tended to stimulate MO2, JAmm, and drinking rate. However, long-term exposure to low levels of silver depressed both JAmm and MO2, and also led to decreased drinking rates. Both inhibition and stimulation of Na+/K+-ATPase activity occurred, dependent upon length and concentration of exposure, salinity (18 vs 30 ppt), tissue (gill vs intestine), and fish species (sculpin vs midshipmen vs rainbow trout). While the effects were variable, due to differing balances between inhibitory and compensatory responses, chronic silver exposure significantly altered Na+/K+-ATPase activity levels in almost all tests. In total, these findings reinforce the view that intestinal osmoregulatory function (drinking, Na+/K+-ATPase activity) is an important site of toxic impact for waterborne silver, that gill Na+/K+-ATPase activity is also a site of impact, and that chronic exposures at silver concentrations (1.5, 14.5 μg/l Ag) close to current or proposed water quality guidelines (albeit much higher than normal environmental levels), exert a variety of sublethal effects on marine teleosts.

Original languageEnglish (US)
Pages (from-to)161-178
Number of pages18
JournalAquatic Toxicology
Volume54
Issue number3-4
DOIs
StatePublished - Jan 1 2001

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Keywords

  • Ammonia
  • Drinking rate
  • Metabolic rate
  • Na + /K + -ATPase
  • Physiology
  • Seawater
  • Silver
  • Teleosts

ASJC Scopus subject areas

  • Aquatic Science

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