[EdKruzel]

An accidental stinging would be bad and is always a possibility, however there are many more reasons not to feed any predator by hand.

In the case of lions, they have a grasping row of teeth like cartilage that can tear your skin.
In that case a bacterial infection is a possibility.
Next is the contaminants that our natural oils and bacteria from our skin that may pass on to our fish.

In the case of fish with larger teeth, such as a moray species, I have witnessed a shopkeeper have two fingers skinned and sliced in a flash.

These fish don't love or appreciate us, they only recognize a food source and if your fingers get in the way, then so be it...

Be careful,
Ed