Rare venomous yellow-bellied sea snakes have been washing up on Eastern Cape and Garden Route beaches, prompting marine experts to caution against touching these deadly creatures and advising to contact aquariums for assistance.

In the past year, six venomous yellow-bellied sea snakes have washed up on beaches in the Eastern Cape and along the Garden Route.

Brett Glasby, the marine wildlife programme management coordinator for the Two Oceans Aquarium Foundation, said seeing these snakes is rare and he has never spotted one himself, except when he was called out to help where one was found.

"It is not a common thing for them to wash up. They like warm water and we find them in the Agulhas current mostly," Glasby said.

But, he added, strong sea currents and bad weather sometimes push these snakes into cold currents where they sustain "cold shock" and are not able to swim further.

"I only know of a handful that have washed up in the last few years. I was lucky to rescue one. They don't do well in captivity so I have released it again," Glasby said. "If you see one you are very lucky. It is a rare event."

If anybody spots a sea snake on the beach, it should be treated with respect and it is best to notify the nearest aquarium. Glasby said neither humans nor dogs should approach it.

"It would be...