The jellyfish and Portuguese man-of-war have long, stinging tentacles. They produce lines of redness and burning pain. Sometimes they cause generalized symptoms, such as weakness, chills, fever, or vomiting.
First Aid:
Call your child's health care provider immediately if:
Venomous fish--such as the stingray, stonefish, and scorpion fish--always cause pain and redness in the area that was stung. They also often cause weakness, sweating, fever, vomiting, muscle cramps, or even shock. The stingray has one or more venomous spines on its tail. The stinging fish usually have venom in dorsal spines.
First Aid:
Fortunately, the venom of all these fish can be destroyed by heat.
Call your child's health care provider immediately if:
Some fish--for example, moray eels, sharks, barracudas--cause a bite mark without injecting any venom.
First Aid:
Wash the area with sea water. Later, wash with soap and water.
Call your child's health care provider immediately if:
Sea anemones (sea nettle) or coral can cause swelling and pain in the area that was touched for 24 to 48 hours. A sea urchin can cause pain if part of a venomous spine breaks off in the skin. If not removed, it may dissolve or cause a persistent tender lump (a foreign-body reaction).
First Aid:
Also, neutralize the venom with a hot water soak (see venomous fish first aid for details). If a large fragment of a sea urchin barb is in the skin, try to remove it with a sterile needle and tweezers as you would do for a sliver.
Your child may feel shocked, stunned, or partially paralyzed after contact with an electric eel.
First Aid:
Your child needs no treatment other than lying down with the feet elevated until he or she feels better. Your child will feel and act normal in 20 to 30 minutes.