Which marine creatures are attracted to shiny objects?

Barracudas are muscular fish with streamlined, torpedo-shaped bodies. They are equipped with an impressive set of razor-sharp teeth. The lower jaw juts out past the upper jaw and both are filled with dozens of teeth.

Barracudas hunt more by sight than smell; a fact that may lead to unfortunate attacks on human divers. Barracudas are attracted to shiny objects, like the silvery fish they prey on. Humans that enter the water with glittering objects, such as watches and jewelry, may cause curious barracudas to investigate and mistake these objects for a food source. The number of attacks on humans is probably overstated, but divers that enter the water where barracuda are present should remove shiny objects as a precaution.

Interestingly, ingesting barracuda is considerably more harmful to humans than eating any other fish species. People often become ill from ciguatera fish poisoning after ingesting barracudas, perhaps because the reef fish that barracudas eat themselves consume algae that may contain high levels of the toxin.