What is a weever fish?

I was looking up some weird symptoms I have been having today on the webmd symptom checker. A little box popped up that said:

Refine your symptoms:
Trembling associated with...
Recent spider bite?
Weever fish sting?
Diabetes?
Cocaine use?
Cannibalism in Papua New Guinea?
None of the above?

And now Bill is doubting my account of my recent trip to Papua New Guinea....