Well flatulence is definately one cause for bubbles, but, when you push a solid object through water at speed, depending upon the density, you will cause the water to oxegenate. This is what causes cavitation when you spin your props too hard. This is where your bubbles come from.
This is also how fish gills work, as water is forced across and through them, the water oxeygenates, the bubbles stay behind allowing the oxeygen to be absorbed and the rest moves on.
just more useless knowledge from my underworked brain
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