As beachwalkers we have all seen the interesting animals that seem to arrive together from time to time on a “Blue Tide”.
The “Bluebottle” jellyfish or Portuguese man of War, Physalia utriculus seems to be the star of the show. Other creatures that are often seen on the tideline at the same time are:
Glaucus Atlanticus a dramatic and beautiful nudibranch see http://www.seaslugforum.net/find/glauatla for more information on this animal and also Velella, Porpita and the Violet Snails Janthina
Lesley Jensen found an interesting article from Tasmania where the author has seen blue tides there for the first time recently.
Called ‘The Blue Fleet” by naturalist Sir Alistair Hardy these occurrences are a frequent sight along our coastlines.