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

• 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.

• 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.

Dots aroundThis sharks mouth are ampullae

• 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