1. Invertebrates Octopus Video

2. Phylum Chordata C. Vertebrata Share four chordate characteristics + vertebral column (spine, backbone) Spine encloses and protects nerve cord (spinal cord) Anterior end of spinal cord = brain protected by skull made of bone or cartilage 1. Fishes Oldest group of vertebrates (530 mya ) 27,000+ species (15,600+ marine spp.) Three major groups

3. Fishes

4. A.Class Agnatha – Jawless fish No jaws Unpaired fins and no scales 1.Hagfishes

5. Fishes A.Class Agnatha – Jawless fish 1.Hagfishes

6. Fishes A.Class Agnatha – Jawless fish 2.Lampreys

7. Fishes B.Class Chondrichthyes – Cartilaginous Fishes Includes sharks, rays, skates and ratfish Cartilage skeleton Movable jaws Paired and Unpaired fins Placoid scales

8. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Fusiform body Heterocal caudal fin Characteristic dorsal fin Gill slits Powerful jaws

9. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Wide size range

10. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Very good sensory organs

11. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Reproduction – live young or eggs

12. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 1.Sharks Commercially hunted

13. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates Dorsally flattened bodies Demersal Ventral gills Modified pectoral fins a.Stingrays

14. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates Dorsally flattened bodies Demersal Ventral gills Modified pectoral fins a.Stingrays

15. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates b.Electric Rays

16. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates c.Manta Rays

17. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 2.Rays and Skates d.Skates

18. Fishes B.Class Chondrichthyes – Cartilaginous Fishes 3.Ratfishes

19. Fishes B.Class Osteichthyes – Cartilaginous Fishes Skeleton of bone Make up 96% of all fish Cycloid and ctenoid scales Operculum Homoceral fin

20. Fishes B.Class Osteichthyes – Cartilaginous Fishes Fin rays Terminal mouth Swim bladder

21. Fishes - Biology A.Body Shapes Strongly related to lifestyle

22. Fishes - Biology A.Body Shapes 1.Fusiform Video

23. Fishes - Biology A.Body Shapes 2.Laterally Compressed Video

24. Fishes - Biology A.Body Shapes 3.Flattened

25. Fishes - Biology A.Body Shapes 4.Eel-like Video

26. Fishes - Biology A.Body Shapes 5.Unusual, Irregular Video