Marine Vert.-- ppt 4 (Swim Bladder and Buoyancy)

Where does the swim bladder develop from?

the gut

What is function of the swim bladder?

-regulate buoyancy

-energy conservation

What fish do not have a swim bladder?

-Chondrichthyes

-benthic fishes

What does the gas gland excrete?

lactic acid

What is the purpose of lactic acid in the swim bladder?

Causes hemoglobin to drop oxygen which diffuses into bladder

What keeps oxygen concentration high in the gas gland?

rete mirabile

Where is oxygen reabsorbed into the blood from the gas gland?

oval window

What are the two types of gas bladder?

physostomous and physoclistous

How does the swim bladder work in physostomous fish?

-connection between bladder and esophagus

-gulp or burp air to regulate pressure in bladder

How does the swim bladder work in physoclistous fish?

-dependent on gas gland and oval window to regulate pressure

T/F Fish do not make sound.

False — fish can produce should with the gas bladder

How do Chondrichthyes regulate buoyancy?

-large fatty liver

-constant swimming. large pectoral generate lift

What is the oily lipid found in Chondrichthyes liver?

squalene