DHA (A,D) and arachidonic acid (AA) (B,E) composition, and the AA/DHA ratio (C,F) in erythrocytes (A–C) and forebrain, (D–F) of adult rats maintained on the control diet (CON), n-3-free diet (DEF), and fish oil-fortified diet (FO) during peri-adolescent, development. Diet groups are separated into those that received prior saline or AMPH dosing. Values are group mean ± S.E.M., *P ≤ 0.05, **P ≤ 0.01, ***P ≤ 0.0001 vs. CON, ###P ≤ 0.0001 vs. FO