An enriched stable-isotope approach to determine the gill-zinc binding properties of juvenile rainbow trout (Oncorhynchus mykiss) during acute zinc exposures in hard and soft waters

Environmental Toxicology and Chemistry
Andrew S ToddJames E Ranville

Abstract

The objective of the present study was to employ an enriched stable-isotope approach to characterize Zn uptake in the gills of rainbow trout (Oncorhynchus mykiss) during acute Zn exposures in hard water (approximately 140 mg/L as CaCO3) and soft water (approximately 30 mg/L as CaCO3). Juvenile rainbow trout were acclimated to the test hardnesses and then exposed for up to 72 h in static exposures to a range of Zn concentrations in hard water (0-1000 microg/L) and soft water (0-250 microg/L). To facilitate detection of new gill Zn from endogenous gill Zn, the exposure media was significantly enriched with 67Zn stable isotope (89.60% vs. 4.1% natural abundance). Additionally, acute Zn toxicity thresholds (96-h median lethal concentration [LC50]) were determined experimentally through traditional, flow-through toxicity tests in hard water (580 microg/L) and soft water (110 microg/L). Following short-term (< or =3 h) exposures, significant differences in gill accumulation of Zn between hard and soft water treatments were observed at the three common concentrations (75, 150, and 250 microg/L), with soft water gills accumulating more Zn than hard water gills. Short-term gill Zn accumulation at hard and soft water LCS0s (45-min median...Continue Reading

Citations

Sep 20, 2012·Archives of Environmental Contamination and Toxicology·A ShynG K Bielmyer
Sep 15, 2014·Environmental Pollution·Masoud M ArdestaniCornelis A M van Gestel
Aug 27, 2013·The Science of the Total Environment·Laurie S Balistrieri, Christopher A Mebane
Dec 6, 2014·Environmental Toxicology and Chemistry·Kevin J Farley, Joseph S Meyer
Dec 28, 2019·Environmental Toxicology and Chemistry·Christopher A MebaneChris M Wood
Nov 25, 2014·Environmental Toxicology and Chemistry·Kevin J FarleyEdward Tipping
Jul 22, 2021·Environmental Toxicology and Chemistry·Christopher A MebaneRobert N Brent

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