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my dicktionary
Yes, they move up and down the water column to eat and avoid danger.
swim bladder
Yes, water waves typically cause objects floating on the surface to move up and down. This is due to the oscillatory motion of the water particles as the wave passes underneath the object, causing it to bob up and down as the wave crest and trough move past.
Yes, they move up and down the water column to eat and avoid danger.
to move up and down in water
to move up and down in water
With their tails; although the subs is mechanical.