1. Introduction to Fishes

2. Classificaiton Kingdom Animalia – Phylum Chordata Classes – Agnatha – Chondrichthyes – Osteichthyes

3. Class Agnatha Most primitive fish class – 7 gill slits The jawless fish Includes hagfish and lampreys

4. Class Agnatha Structure – Circular mouth – Smooth, scale-less skin – Incomplete cartilaginous skeleton – Prominent notochord

5. Class Agnatha More structure – Lack paired appendages – Lack upper and lower jaws Have an oral sucker – Used to eat and attach to prey Parasitic

6. Class Chondrichthyes Cartilaginous fish – Chondros = cartilage, ichthyes = fish – Sharks, skates, rays

7. Class Chondrichthyes Structure – Full cartilaginous skeleton – Exhibit paired appendages – Loosely articulated lower jaws

9. Class Chondrichthyes More structure – Skin covered in tooth-like denticles Placoid scales Feel like sandpaper – Protection and speed – No swim bladder Must swim or sink – 5 to 7 gill slits

10. Class Osteichthyes Bony fish – Osteo = bone Skeletons of bone and cartilage Largest, most numerous fish class Commercially important