A bay in San Diego has been overrun with harmless Moon Jellyfish, much to the wonderment of local swimmers and paddle boarders.

Tony Amicangelo, a travel photographer, took a jaw-dropping video of the jellyfish swarm as he paddled through the waters of Mission Bay with friends.

He also braved the waters to swim among the jellies, but because moon jellies rarely sting humans (and even when they do the venom isn't felt), he was able to navigate the bay unharmed.

Scroll down for video

Moon jellyfish rarely sting humans and even if they do it is rarely felt unless the stingers penetrate a wound or mouth

San Diego's Mission Bay has become overrun with thousands of harmless moon jellyfish, much to the intrigue of paddle boarders

Tony Amicangelo (pictured), a travel photographer, took a jaw-dropping video of the jellyfish swarm as he paddled through the waters

'Swimming with them was one of the most bizarre things I've ever done,' Amicangelo told Fox 5.

When Amicangelo found out Mission Bay was swarming with jellyfish, he almost canceled his paddle boarding trip.

But after he was told they were harmless, he decided it was something he needed to see and experience first hand.

Other paddle boarders were equally confused and intrigued by the sea of jellies, which invaded the bay in April.

Paddle boarder, Sarah Rigby said: 'As I was paddling out, there was one jellyfish, five jellyfish, twenty jellyfish and then all of the sudden it was like a sea [of them] it was all white.'

When Amicangelo found out Mission Bay was swarming with jellyfish, he almost canceled his trip but once he was told they were harmless, he needed to see them for himself

In the video filmed by Amicangelo the moon jellyfish can be seen floating lazily in the waters and he is able to touch and scoop them up

Moon jellyfish are usually about 10" to 16" in diameter and can be recognized by their four horseshoe-shaped gonads in the center of their circular bodies, according to Fox 5.

They only live for about six months.

In the video filmed by Amicangelo, the jellyfish can be seen floating lazily in the waters as the photographer scoops them upin his hands.