2. GENERAL CHARACTERISTICS
 They are aquatic animals, both freshwater and
saltwater .
 Are ectothermics: body temperature are dependent on
having the water.
 They can feed in different ways: filter feeders,
predators, carnivores…

3. GENERAL CHARACTERISTICS, II
 Body adapted to swimming, spindle-shaped and
covered with scales.
 They have gills for breathing and heart divided into
two chambers, an atrium and a ventricle.
 They have separate sexes. Most are oviparous, some
ovoviviparous.

4. Groups:
Jawless fish
Cartilaginous
Bony fishes

5. Cartilaginous:
 Cartilaginous skeleton .
 Dermal denticles skin.
 Caudal fin with unequal lobes.
 Without protection in their gill opening.
 Includes: sharks, rays ...

6. Bony fishes:
 Skeleton bone.
 Scaly skin.
 Caudal fin with equal lobes.
 Gills covered by a cap.
 Include most of the fish.

7. Jawless fish
 No mandibles.
 Without even limbs.
 Fish were incorrectly considered by their habitat and
the shape of your body.

8. Parts of the fishes

9. curiosities
1) The fish is the only animal that can see infrared and
ultraviolet light
2) A tuna can swim 100 miles in a single day
3) The lungfish can live out of water for three years in a
state of suspended animation
4)The blanket has gigantic fins larger than 6 m from the
tip of one flap to the other