Effects of tritiated water on locomotion of zebrafish larvae: a new insight in tritium toxic effects on a vertebrate model species.

•A decrease in basal velocity was found at 0.4 mGy/h in 96hpf larvae.•The 0.4 mGy/h dose led to a decrease in the response to a tactile stimulus in larvae.•Embryos spontaneous movement and larvae heart rate were not affected by 3H exposure.•3H did not induce cataract phenotype nor DNA double-strand break in 24 hpf embryos.