Injury can result from skin contact with any part of the jellyfish. Exposure causes pain, redness, itching, swelling, skin irritation and blisters. If exposed to a jellyfish, do not rinse the area with fresh water and do not rub the area. These measures will cause stinging cells to fire further, causing more pain. Call the Poison Center for more advice.
Stingrays have a barbed spine on their long tails that can cause painful and dangerous stings.
Stingrays can thrash their tails side to side and up and down, causing glancing blows as well as actual stings. Because the stinging spine has jagged edges, the wounds can be ragged, deep and bleed extensively. A stingray does not attack but will sting if surprised or provoked. Once stung, the pain is intense. There may also be nausea, vomiting, abdominal pain, difficulty breathing and shock.