nice shot

Nice... might be good in B&W too. Looks like a seafood dish

Great shot..

looks like dropped grapes.

Thanks friiskiwi for comment. I don't think it was grapes, it's size was less than 1 Sm in diameter.

Strange, could it be some kind of seaweed? Great detail.

nice shot. There is such a thing as seaweed grapes, but I dont know the exact name.
Good luck

Friiskiwi, I thought so too, that it was some kind of seaweed.
Thank you for comment cabldawg71, you cleared our doubts.

Those aren't seagrapes. They are much larger. It looks like a piece of Sargasso Weed with the leaves broken off. They are that color and have small grape-like "berries" on them.

Thank you kyricom, Honestly I didn't know that Sargasso weed is present in Mediterranean, I thought it was only somewhere near Australia.

I grew up on an island off the coast of Florida, and we got it all the time. I think it's found all over, just named after the Sargasso Sea

Wow, kyricom, thank you for info, now it would be interesting to see how it's growing.