1. Osteichthyes
Bony fishes

2. Characteristics 98% of all fishes ½ of all vertebrates
Scales- formed from bone
Cycloid- smooth, rounded edge
Ctenid- toothed outer edge

3. Characteristics of bony fish

4. Differences b/t bony and cartilage fish???
Operculum- keeps water from flowing in the wrong direction
Mouths- terminal in bony; ventral in cartilaginous
Teeth- attached to jaw. Do not move forward.
Fins- bony fish fins are thin membranes with spines or rays
Spines- rigid; support and protection
Rays- flexible
Caudal fins lobes are about same size

5. Internal Anatomy Big Difference-
Bony fishes have a swim bladder or air bladder.
Used to maintain natural buoyancy- ability to maintain certain depth without moving.
Fish can regulate how much air it holds
Moves up and down in water column
Cartilaginous fish have an oily liver.
Sink when they stop swimming.
Cannot float

7. BBC Nature - Ray-finned fishes videos, news and facts