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Neutrally Buoyant
neither sinking or rising
Elasmobranchs
oily livers help pelagic fish (static lift) (oil is less dense than water)
Two functional types of swim bladders
Physostomous
Physoclistous (not connected to GI tract)
Physostomous swim bladder
connected to GI tract via pneumatic duct
Salting out
gasses in blood released into swim bladder
Root effect
releases O2 from hemoglobin
reduces carrying capacity of the blood to carry oxygen
Barotrauma
pressure induced, internal damage
fish moving upward in water column must release gas from the swim bladder in order to avoid this