Skip to book content
ELASMO - My Life Underwater
by Pamela Mason
My Life Underwater
Hey Elasmo! My name is Nosey.
How come you can live underwater, but me and my land friends can't? As much as we try, we can only stay down for a little while!
Nosey - you can swim on the surface, but not breathe underwater. I will explain how sharks are better suited to life underwater than you are!
It's you who adapted to live OUTSIDE of water.
If you saw my last adventure, you might remember that it was the ocean creatures that came first!
Are sharks fish?
All sharks are fish, but not all fish are sharks!
Most fish are made of rigid bones.
I'm an elasmobranch - my skeleton is made of cartilage, instead of bones.
Cartilage is so flexible that I can touch my own tail!
Tell me more! This is amazing!
Humans have cartilage in their ears. Hold your ears and give them a wiggle - they should be bendy, but very strong!
Tell me more! How do you get oxygen from water?
All fish have gills.
It may be easier to show you some pictures!
Boney fish have a pair of covered gills instead of lungs, but most sharks have 5 pairs of gill openings, and some even have 6 or 7!