yes they are long lasting.... but u dont keep ur hook in the water 24/7 365 as if it where in a fish!!! the salt and acids of the stomach dissolve that hook alot quicker. so me putting a "hook in a glass of water" wont prove a thing
and they are not using large gauged hooks for those small rays!
Regardless of that it would take years to make that hook disolve... I'm interested in seeing someone try this experiment... what acids are similar to the stomach? I'll do it if I can get my hands on some.
Parietal cells produce hydrochloric acid, a strong acid that helps to break down food. The acid in your stomach is so concentrated that if you were to place a drop on a piece of wood, it would eat right through it. ­The g-cells produce gastrin, a hormone that facilitates the production of hydrochloric acid by the parietal cells.