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Effect of nanosilver on metabolism in rainbow trout ( Oncorhynchus mykiss ): An investigation using different respirometric approaches
Author(s) -
Murray Laura,
Rennie Michael D.,
Svendsen Jon C.,
Enders Eva C.
Publication year - 2017
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.3827
Subject(s) - rainbow trout , metabolic rate , metabolism , trout , biology , fish <actinopterygii> , zoology , toxicology , fishery , endocrinology
Nanosilver (nAg) has been incorporated into many consumer products, including clothing and washing machines, because of its antimicrobial properties. Consequently, the potential for its release into aquatic environments is of significant concern. Documented toxic effects on fish include altered gene expression, gill damage, and impaired gas exchange, as well as mortality at high nAg concentrations. The present study reports the effects of nAg on the metabolism of rainbow trout ( Oncorhynchus mykiss ). Fish were exposed to environmentally relevant concentrations (0.28 ± 0.02 μg/L) and higher (47.60 ± 5.13 μg/L) for 28 d, after which their standard metabolic rate (SMR), forced maximum metabolic rate (MMR f ), and spontaneous maximum metabolic rate (MMR s ) were measured. There was no effect observed in SMR, MMR f , or MMR s , suggesting that nAg is unlikely to directly affect fish metabolism. On average, MMR s tended to be greater than MMR f , and most MMR s occurred when room lighting increased. The timing of MMR f chase protocols was found to affect both MMR f and SMR estimates, in that chasing fish before respirometric experiments caused higher MMR f estimates and lower SMR estimates. Although compounded effects involving nAg and other environmental stressors remain unknown, the present study indicates that the tested range of nAg is unlikely to constrain fish metabolism. Environ Toxicol Chem 2017;36:2722–2729. © 2017 SETAC