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Rec & Adventure  Summer is the time for jellyfish encounters in
San Diego  See also  When the waters off of San Diego rise in
temperature during the summer months, so does the number of
jellyfish and jellyfish encounters. While not every species of
jellyfish are harmful to humans, there are a few species that
can cause painful stings if touched, even when dead or on the
shore. This year, a rare black jellyfish species, also called a
black sea nettle (Chrysaora achlyos), has made their appearance
in numbers off the southern California coast.  Jellyfish live in
every ocean in the world, though they are more frequently
encountered in some areas more than others. They are a simple
form of life with a simple nervous system and venomous tentacles
for catching and stinging prey. They have no eyes and can only
sense light and dark and chemicals in their environment. They
hunt mostly by stinging prey they encounter while floating or
swimming by propelling t