5. How different are the
swimming strategies in
osteichthyes and in
chondrichthyes? Why do
sharks need to agitate their
body to swim while bony
fish do not?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Bony fish have specialized organ
called gas bladder, or bladder,
whose interior be filled with
liberated from gas . The swim
bladder as a hydrostatic
since it varies relative density of
body regulating buoyancy the depth
of animal in water.

do not have
bladders and thus must
continuously agitate body to keep
and maintain their in
water. As additional swimming aid,
chondrichthyes the liver big and oily;
feature helps to their body
density to water.