Strategies of Buoyancy in Agnatha

Question 1

What 2 strategies to agnatha use to achieve buoyancy?

Answer 1

• retention of low density compounds
• cartilaginous skeleton (ancestral)

Question 2

What low density compounds do agnatha have? What is their specific gravity?

Answer 2

• large fatty livers (lipids)
• 0.9-0.92 (NEG BUOYANT)

Question 3

What do agnatha lack?

Answer 3

• gas bladder