>You don't have lungs (water respiration doesn't work this way in any creature I know of), so you can't "blow" anything. You might have heard about mantle, an

>You don't have lungs (water respiration doesn't work this way in any creature I know of), so you can't "blow" anything. You might have heard about mantle, an organ that distinguishes mollusks. Many of them use it to circulate water around the gills and some are so good with it that they can create a water jet and shoot it with such a force that they swim in the opposite direction.