There are poisonous fish and aggressive fish, but they will not attack unless they are touched carelessly or provoked.
If you get injured, stop diving immediately, give first aid and go to the hospital immediately.
Also, do not suck out poison from your wounds by mouth.

Don't forget the first aid kit

■First Aid1

*Goby　*Scorpionfish *Lionfish *Rockfish　*Ray　*Diadema setosum
*Sea urchin　*Crown-of-Thorns Starfish　*Carinate blenny

1. Rinse the wound with clean and cold water.
2. Remove thorns and debris left on the wound by tweezers.
3. Squeeze the poison out of the wound.
4. Let's immerse the wound in hot water around 50 ℃.
   If your wound cannot be soaked in hot water, warm it with a disposable warmer.
5. Try to raise the wound above the heart as much as possible.