Actually, these advertisers don't seem to be very picky about what marine organism they use. A quick Google image search for "weird food" "blood pressure" finds these.
Google images of it: "Glaucus atlanticus". It's an absolutely amazing little creature.
This one is just calamari salad (Insalata di calamari) from the Angela's Italian Organic Oregano website.
Snack Attack blog.
Aplysia californica). The image comes from the Gray Whales of San Ignacio Lagoon weblog (text by Tom O’Brien, photos by Karen Capp).
Edit: Dan Schwab of Keytoons explains at Weird Food (for yout heart!). There is a partial pertinence, in that the ads are for a new supplement in vogue, partially based on calamari oil; that at least explains the squid.