Assessment of mercury and selenium concentrations in captive bottlenose dolphin's (Tursiops truncatus) diet fish, blood, and tissue

► Captive dolphins ingest less Hg from their diet compared to those in wild dolphins. ► Captive dolphins have lower blood Hg levels than those in wild dolphins. ► Higher Se:Hg molar ratios were observed in the blood of captive dolphins. ► Captive dolphins may be less susceptible to the potential toxicity from the CH3Hg+.