Water is being ejected from the ventral pouch, through the baleen filter, during this final stage of a lunge feed.
From 2010 08-24 Far West SB Channel
A Humpback Whale (Megaptera novaeangliae) expels a mouth full of water through its baleen. The belly side is facing the camera.
From 2009 08-01 SB Channel All Day ACS Trip
A massive ejection of water from the mouth of a Blue Whale (Balaenoptera musculus) as it collapses its ventral pleats and filters out the krill.