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Plasma concentration of testosterone (T) in adult male fathead minnows caged for 4-d at sites within the Maumee AOC in April (black bars) and June (white bars) 2016. The GLTED (Great Lakes Toxicology and Ecology Division) control fish were maintained in Lake Superior water at the GLTED facility. Bars represent mean (± standard error; n = 8–12 per site). Asterisks indicate significant difference from the GLTED control (p≤0.05).
