The beachgoers are advised to be on alert as a poisonous species of jelly-fish like creatures have been spotted on New Jersey beach, including in Harvey Cedars on Long Beach Island. The spotting of the threatening Portuguese man o' war has raised an alarm.

Experts inform that these jelly-fish like creatures have tentacles as long as 30 feet, which they tend to wrap around their prey and a painful sting that injects poison into the victim that can eventually lead to shock, fever and respiratory problems.

Trystin Figell, Jenkinson's Aquarium marine biologist informed that Portuguese man o' war, are usually found in warmer waters, like off Florida's coast. Figell added that these poisonous creatures have a gas-filled swim bladder, so they rely on the wind and currents and this is how they likely arrived along New Jersey's coastline with the Gulf Stream.

Dr. Robert Glatter, of Lenox Hill's emergency room, has warned not to touch the man o' war even if you come across one that appears to be dead as it still can sting you. Glatter advised that checking your surroundings is the best way to avoid man o' wars, jellyfish and other dangerous marine animals. Glatter added that if you have trouble breathing or feel choked then you need to seek immediate medical help.

The health officials also advise that if you fall prey to the toxic sting, remove the tentacles from your skin at once and apply salt water to the affected area.

The beachgoers have reacted intensely on the recent warning and many Jersey shore vacationers have been reported to be more cautious while swimming in the ocean this summer.