air bladder

Many fish therefore evolved an internal air bladder that vibrates with passing sounds.

The stipe, or stem, attaches to the holdfast and supports the blades, which typically float in the water, thanks to air bladders.

Over the years, engineers updated the basic design with more robust face masks and newer internal padding such as air bladders and gel padding.

Among the rescue crew were members of the Wenatchee Valley Fire Department, who were tapped to use air bladders to lift the boulder.

They’re a long, thin fish that can breathe air through an air bladder like a lung and can live up to four days out of water if they’re kept moist, experts said.