1. Fish

2. Fish I. Fish A. 540 MYA appear in the oceans.
B. Water dwelling vertebrates
1. Scales: (There are 4 types)
2.Fins (vary: caudal, anal,
pectoral…)
3. Throat with gill slits

3. Fish C. Types 1. Jawless a. most primative 1. Lack jaw 2. Lack scales
3. Lack paired fins

4. Fish
b. No bones
c. Examples
1. Hagfish
2. Lamprey

5. Fish 2. Cartilaginous a. Skeleton made out of cartilage.
b. Most have tooth-like scales.
c. NO swim bladder
d. Examples
1. Sharks
2. Skates :Egg laying, prominent
dorsal fin
3. Rays : Bear live young

6. Fish 3. Bony a. Have a swim bladder; gives buoyancy b. Color vision
c. Distant touch; lateral line
that senses movement.