The strange being of the sea [ENG] [PHOTO]

Walking along the coast looking for crabs with my family, we observed that there was something black in a temporary small pool formed by the continuous dreary where this black was trapped, that moved with your control causing the water around it to move and this being could be move, we had no idea what it was like and much less how to help it.
we recorded it and showed it to someone who knew about the subject and told us about the aplysias, these gastoropods, like all mollusks, are reproduced by a larval stage, for this reason they can be seen in ponds, swimming pools, water tanks dedicated to aquaculture.

In what sense are they a problem? these in many studies have been cataloged as a vector of diseases, which could arise from these in an epidemic in the organism that wants to cultivate. these horganismos are planktonic herbivores in the first stages and consumer of macroalga to be in adult stage, their colors are very varied after this example I have also seen in person some more beautiful as green, there are many colors on the internet, this left me always a bad taste, because I always think that in other oceans creatures are more beautiful than those around me. Anyway, this is a good example. I do not know if these organisms can be consumed. I really do not know about this information. One thinks that because it is a mollusk, it can be related to octopus, squid, cuttlefish, but the truth is that we have a relative of the snail. sure it still sounds delicious but for me it is something that only a Chinese or a Japanese would eat
LOL
apologize for the little joke

The sea is full of beautiful creatures, awesome creatures, ugly creatures we can always learn a little more if we approach the sea, I search for crabs I found many knowledge that helped me out of doubt ... the first most necessary all my doubts: to know what was this black thing that moved in a disoriented way.
in the comments you can place a photo of something that impressed you from the sea?

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