Effects of chronic dietary selenomethionine exposure on repeat swimming performance, aerobic metabolism and methionine catabolism in adult zebrafish (Danio rerio)

► Adult zebrafish were exposed for 90 d to diets augmented with selenomethionine. ► Swim performance (Ucrit) was impaired in zebrafish fed 3 μg Se/g dry mass. ► O2 consumption, standard metabolic rate, and cost of transport were greater. ► Aerobic scope of fish fed elevated dietary selenomethionine was lesser than controls. ► mRNA abundance of several key proteins involved in energetics was altered.