Hydrogen sulfide exposure reduces thermal set point in zebrafish.

Behavioural flexibility allows ectotherms to exploit the environment to govern their metabolic physiology, including in response to environmental stress. Hydrogen sulfide (HS) is a widespread environmental toxin that can lethally inhibit metabolism. However, HS can also alter behaviour and physiology, including a hypothesized induction of hibernation-like states characterized by downward shifts of the innate thermal set point (anapyrexia).