system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do fish wounds clot and close over, especially for extreme large wounds?
gpt
Clotting doesn’t actually require drying out. There are cells in blood whose job is to gather at wounds and stop the blood from flowing out, from the inside. Even human wounds can close underwater, so you can be sure that fish are even better at it.

The only complicating factor is if the water is flowing past the wound fast enough to physically wash it out.