Hepatic mRNA expression of (A) ER α, (B) ER βa and (C) ER βb in naïve females caged at Tuckerton and Newark Bay for 1 and 2 months. Killifish were caged starting May 24th, 2009, for 1 or 2 months duration with collections on June 22nd and July, 21st, 2009. Bar graphs are presented as mean ± standard deviation. N = 6-8 individuals per group. *Significantly different from Tuckerton (p ≤ 0.05).