What is a Fish?

Classification

• Kingdom- Animalia• Phylum- Chordata• Sub Phylum- Vertebrate• Classes- Jawless, Cartilaginous & Bony Fishes

Characteristics of Fishes:

1. all Vertebrates2. all live in water3. obtain oxygen

through gills4. have fins5. most are ectotherms6. MOST have scales

* Laminid- endothermic shark

Let’s go to the Video!https://www.youtube.com/watch?v=IN7ISLbOhGo

https://www.youtube.com/watch?v=Zoygy-8PTtU barreleye For the first time, a large Pacific barreleye fish - complete with transparent head - has been caught on film by

scientists using remotely operated vehicles at the Monterey Bay Aquarium Research Institute. The deep-sea fish's tubular eyes pivot under a clear dome.

3 Major Groups of

Fishes

1. JAWLESS FISHJawless fish: Lampreys, Hagfish

Types of JAWLESS FISH• Hagfish- Ocean

scavengers, eat dead & decaying bodies

• Lamprey- fresh and salt water, they are parasitic and prey on other fish.

* Both have skeletons made of cartilage and sucker-like mouths.

Characteristics of Jawless Fish

• NO jaws– instead have mouths

used for scraping, stabbing, and sucking food

• NO scales

A Sliming Hagfishhttps://www.youtube.com/watch?v=6DlWftios0s

The Sea Lamprey

Sea Lamprey Video Clip

https://www.youtube.com/watch?v=-SYhOD1Yx10

2. Cartilaginous Fish: Sharks, Rays, & Skates

Charateristics of Cartilaginous Fishes

1.Have Jaws2.Have Scales- pointed & toothlike3.Skeletons made of Cartilage4.MOST have live Birth5.Carnivores

Sharks, Skates & Rays

• Sharks and Rays- can’t pump water over gills and must keep moving to breathe.

Skates vs Rays• Skates - egg

laying• Rays- Live

Birth• Skates -

larger dorsal fin

• Rays- Larger than skates

Shaaaaaaark!!!!!

More Shark Attacks??????

They get a Bad Rap :-(

3. Bony Fishes• Bony Fish:

Salmon, Carp, Tuna

• Over 20,000 different species

• 95% of all fish species

Characteristics of Bony Fish….

1. Has jaws2. Has scales3. Pocket on each side of head to

hold gills4. Skeleton of Hard Bones5. Swim Bladder 6. Fins

Swim Bladder• internal balloon-like organ - filled

with gas• helps fish stay stable at different

depths of water using less energy

Fish Respiration• Water flows over

Gills as fish opens mouth and swims.

• Oxygen diffuses from the water into the blood.

Up Close and Personal

Function of the Gills

Types of Bony FishesRay Finned:

– Most fish are this type– Fins are supported by bony

structures called Rays.

Lobe Finned:– Fins are long, fleshy, muscular,

supported by central core of bones.– Thought to be ancestors of

amphibians.– Examples are: Coelacanth, Lungfish

Bizarre Bony Fishhttps://www.youtube.com/watch?v=kZuVyPRhFME

Bizarre Fish the Sequel

Fish Anatomy

Fins

Different Dorsal Fins