quote:
Originally posted by waveslave
Does the Shark Shield zapper repel dolphins as well ?
I think the navy has the dolphin and whale zapper!
Sharks can sense the electric pulses generated by contracting muscles.
"The shark's "sixth sense" is electroreception, the ability to sense weak electric fields. Although humans build devices that detect electric fields, we do not feel the presence of weak fields around us. Sharks not only sense these fields but also rely on them to locate prey and, perhaps, navigate through the ocean.
The receptors responsible for detecting these weak electric fields are concentrated in the shark's head at the base of tiny, jelly-filled canals over the shark's snout and lower jaw and around the eyes. Dark pores on the skin's surface mark the external openings to these sensory structures, which are called ampullae of Lorenzini. The ampullae contain nerve cells that respond to very faint electric stimuli."
So basically you're poking it in the electric eye with a sharp stick.