Transcript Lampreys - Cloudfront.net

Fishes
Kingdom-Animalia
Phylum- Chordate (Notocordat some point can turn into a
backbone)
Class- Jawless
Cartilage
Bony
Jawless Fish
• All Jawless fish do not have Scales – they have
slimy skin and no fins
• Lampreys- are Parasites- animals that feed off
another animal and do harm to that animal
•
- live in fresh and salt water
– They have teeth
• Hagfish- are Scavengers- they feed off of dead
or dying animals . They are also blind.
– live only in salt water
– no teeth, they have tentacles
Class-Jawless
Hagfish
Lamprey
Lamprey
Notice the teeth and suckerlike mouth
Cartilaginous Fish
• Rays
Sharks
Skates
Cartilaginous
• All have Placoid scales which are also,
called Denticles. If rubbed from front to
back it feels smooth. If rubbed back to
front it feels like sandpaper.
• Pectoral Fins- located on sides of body
and are used to change direction and for
gliding in the water. It also helps prevent
sinking . In Rays they are huge and used
for swimming.(7meter span in rays) In
sharks they are stiff.
• Dorsal and Ventral Fins- located on top
and bottom of animal. Used for balance.
• Caudal Fin- along with its tail in sharks is
strong and moves the fish at great speed.
Dots around
This sharks
mouth are
ampullae
• Acute sense of smell. It can detect a
drop of blood nearly half kilometer away.
•
• They have a lateral line located on their
sides to sense movements in the water.
• They also have nerve receptors called
ampullae of Lorenzini- senses electric
fields generated by muscles of fish.
• Do not have a swim bladder instead they have an oily
liver that helps with bouancy which is less dense
• Breathing holes called spiracles located behind each
eye. These are needed because most of these fish have
gills on the underside of their bodies.
• Mostly all cartilaginous fish have mouths on ventral
surface. This was an adaptation for bottom feeding even
though most sharks are not bottom feeders. Skates and
Rays are though.
Notice the gills on the ventral
surface
Shark teeth
Constantly being replaced
Mako shark
Sting Ray
Manta Ray
Skate
• YouTube – Stingray
• YouTube - Manta ray dance
Bony fish
» Striped bass