2. Notes:Bony Fish
Class: Osteichthyes

3. Basic Facts
Have a swim bladder which can be inflated or deflated to change position in the water.
The gills are covered by an operculum (gill covering).
23,000 species
Oviparous

4. Oxygen exchange 1. The gas exchange organs of fish are their gills 2
Oxygen exchange 1. The gas exchange organs of fish are their gills 2. Oxygen passes from the water into the blood at the gills. 3. Removal of carbon dioxide also occurs as the blood containing high concentrations of the waste gas goes to the gills and the carbon dioxide diffuses out into the water down a diffusion gradient.

5. Body Shape the body plan of a fish directly relates to its lifestyle.
1. Streamlined – fast swimmers
2. Laterally flattened – bottom dweller
Tuna
Flounder

6. Body Shape, cont’d 3. Eel-like bodies-live among rocks or vegetation
4. Vertical plane fish – sea horse (slow swimming)
Morea eel
Yellow Sea horse

7. Coloration
colored pigments are found in special cells called chromatophores.
1. Warning coloration – using color to advertise that you are dangerous. (lionfish spines )
2. Cryptic coloration – blending with the environment to deceive predators. (Rockfish)

8. Coloration, cont’d.
3. Disruptive coloration – the presence of color, stripes, bars or spots to break up the outline of a fish.
4. Countershading – light on the bottom/dark on top

9. Tail Shape

10. Mouth Type