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Purple Jellyfish and Purple Predators Strand on Oregon Coast

Published 03/31/2015


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(Oregon Coast) – Some surreal stuff has hit the beaches in recent days, thanks to heavy west winds from earlier in the week. Gobs of weird, translucent little jellyfish have washed up, turning the sands of the Oregon coast into a blanket of purple. Reports have come in from just about every sandy beach in the region. But also coming up are creatures that eat them. (photo above by Tiffany Boothe of Seaside Aquarium).

They're called Purple Sails, but they're not the weirdest part of this tale. Following them onshore are their tinier predators, a freaky little snail called a Violet Snail which actually feeds on the Purple Sails while on the ocean.

Thousands of them are being found on just about every beach along the coastline.

Tiffany Boothe, of the Seaside Aquarium, was among the first to report them in the Seaside area. Her photos show the sheer numbers.

Down on the central coast, at Tillicum Campground near Yachats, a volunteer member of CoastWarch joined in the beach cleanup activities on Saturday and noticed a massive amount of them that day.

“The Beached by-the-Wind Sailors were not nearly as numerous as I remember them being last year,” the volunteer said on the organization's online reports.

Charlie Plybon, of Oregon's Surfrider Foundation, also noted enormous numbers in the Newport area.


He noticed something else, however. (Above: Charlie Plybon's photo of a Violet Snail.)

A tiny snail that's also purple, called violet snails, has followed the velella velella onshore. These are predators of the larger Purple Sails – and they sound like something out of an alien movie.

“Also known as 'storm snails' or 'violet snails,' they make a cool bubble raft, float pelagically and feed on the velellas,” Plybon said.

Their genus name is Janthina. Plybon snapped a picture of one on a Newport beach, which illustrates just how small they are.

All this activity can be traced to the west winds earlier in the week. See the article on Odd Things to Look for After a Storm. Those winds force things inland.

“It's all due to that shift in southerly weather we had,” Plybon said.

Boothe said the velella velella have a clear “sail” that catches the wind and pushes them across the ocean surface. They are fairly common off these waters, but it takes a sizable west wind push to get them on land.

Once washed ashore, they can have another predator – although they die fairly quickly. They soon become food for a variety of beach-dwelling creatures. If they aren't eaten soon, they dry into the translucent “sails” you see on the beach. Then they start to have the unpleasant after effect of smelling pretty nasty. The beaches can have an ugly, fishy stink until they disappear.

They somewhat disappeared for several years until last year, showing not very often between 2007 and 2013. You'd find strandings fairly regularly between 1999 and 2005, and this would create an awful and stifling stink along the beaches when it happened. Several times in the spring and early summer you had to keep your window closed while driving 101.

Boothe described what velella velella eat.

“Purple Sails do not sting their prey; they capture their food with small sticky tentacles,” she said. “Velellas feed on fish eggs and small planktonic copepods. They can reach a size of 4 inches in length and 3 inches in width.”

Photos below by Tiffany Boothe of Seaside Aquarium. Oregon Coast Hotels in this area - Where to eat - Maps - Virtual Tours





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