Fishes KingdomAnimalia Phylum Chordate Notocord at some point

Fishes Kingdom-Animalia Phylum- Chordate (Notocord - at 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 (Chondrichthyes) • 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. (7 meter 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

• You. Tube – Stingray • You. Tube - Manta ray dance

Bony fish v Striped bass