If an axolotl is spawned out of water, they are sometimes able to kill fish that are in the water without even touching them. See video for reproduction.
MC-226412
Axolotls are able to kill fish while they are outside of the water
Open
3
(Unassigned)
Confirmed
Gameplay
Low
Mob behaviour
axolotl
21w20a, 1.17, 1.17.1, 1.18.1, 1.19.1, 1.19.3, 23w05a, 1.19.4, 23w14a, 1.20.1
Retrieved
Can confirm in 1.17.