Do Japanese koi fish have poison or stingers in there tails?

No, Japanese koi fish do not have poison or stingers in their tails. They are completely harmless to humans.

Koi are a type of carp, and like most fish, they have no venomous or stinging mechanisms. Their tails are designed for swimming and maneuverability, not for defense.

However, it's important to note that some people can be allergic to fish scales or mucus, which might cause skin irritation in some cases.