These rays can produce an electric current strong enough to stun prey
and discourage predators. With this formidable defense, electric rays
aren't shy — they're bold enough to approach and even chase divers. You
can recognize them by their round, flabby bodies, tiny eyes, a gray or
bluish-gray back with black spots, and a white underside. They have a
short, stocky tail and a large caudal fin.
Cool Facts
Rays can generate and control electrical charges at will. Muscle
tissues in two kidney-shaped glands on either side of a ray's head can
produce currents of up to 45 volts — an electrical shock strong enough
to knock down an adult. These glands weigh one-sixth of the ray's
total weight. Even though electric rays can be aggressive, there's no
record of them harming humans.
Since contact with a ray's electrical charge can cause numbness,
ancient Romans and Greeks called these rays "numbfish." They believed
numbfish had therapeutic value and applied the rays to their bodies
for treatment of gout, chronic headaches and other maladies. Our
English word "narcotic" comes from the Greek work for numbfish,
"narke."
Electric rays give birth to pups after eggs hatch in the female's
uterus. In the later stages of the eight to 10 month gestation period,
the female's uterine lining secretes liquid food for the embryos.
By night, rays forage two to three feet above sandy bottoms or nearby
reefs. They slowly drift over unsuspecting fishes and stun them with
an electrical charge. As the electric organ discharges, the ray wraps
its disc around the prey to concentrate the electric field and also to
manipulate the fish to be eaten whole (head first). During the
daytime, rays rest snuggled in sandy or muddy bottoms, but they're
awake enough to quickly stun and devour a fish that swims within
jolting distance.
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