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Sharks And Rays
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Published on Nov 19, 2015
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PRESENTATION OUTLINE
1.
CHONDRICHTHYES
2.
CHARACTERISTICS
These are fish with a skeleton made of cartilage
Have scales and heart with chambers in series
Also have jaws with paired fins
They also lack ribs
Well developed electroreceptive system
3.
CLASSES
This class is divided into 2 subclasses
1-Elasmobranchii (sharks, rays, and skates)
2-Holocephali(ghost fish)
4.
HOLOCEPHALI
Chimaeras(often called ghost fish)
One of the oldest and most enigmatic groups of fish today
Closest relative is the shark
Today that are largely confined to deep water
5.
REPROCUCTION
The male injects the female with sperm
Internal fertilization
Produce few yolky eggs
6.
CHARACTERISTICS
They have teeth-like scales
First fish to have paired fins
Have 5-7 gill slits on either side
No swim bladder
Very good sensory system
7.
SOME FACTS
If sharks were able to sleep they would die from lack of oxygen
Sharks strike blind
Most live in saltwater but some are known to spawn and feed in freshwater rivers
Holocephali have one gill opening and there upper jaw is fused with their skull
They also have no teeth
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