Of the 30 fish per treatment group used for behavior studies
(Reyhanian et al., 2011), 15 fish from each group were sacrificed at
14 days directly after the behavior tests. Organs were isolated for the
analysis of gene expression. Fish were sacrificed by anaesthetization in
0.5‰ 2-phenoxyethanol (Sigma-Aldrich, Sweden) followed by decapitation. Testes (15/group) and livers (5/group) were dissected and immediately frozen at −80 °C in RNA later (Sigma-Aldrich) to be used
for the current gene expression study by qPCR.
All experiments and fish husbandry were performed according to
the Swedish Animal Care legislation, approved by the Southern
Stockholm Animal Research Ethics Committee (Stockholms Södra
Djurförsöksetiska Nämnd, Dnr S130-09).