Animals - Fish

3 groups:

  • jawless: no biting jaws, but sucker disks with a rasping tongue and small teeth made of keratin. The lampreys (七鳃鳗) are the only jawless fish.
  • cartilaginous: skeleton made of cartilage instead of hard bone. Most are predators with sharp senses. Sharks and rays: most fish are bony, but sharks and rays have skeleton made of springy cartilage.
  • bony: have a hard bony skeleton and a swim bladder.


  • lobe fin: fleshy fins, used to "walk" on the seabed or riverbed
  • ray fin: most fish belong to this group. fins are supported by a fan of jointed rods called rays.


  • Sturgeon 鲟. Caviar is made from the eggs of the sturgeon.
  • mudskipper: can survive out of water by absorbing oxygen from the air through its skin.



Basking shark: the world's second largest fish, after the whale shark. Feed by swimming with its vast mouth gaping wide.


  • Giant Manta ray: the biggest ray. Can leap out of the water when trying to avoid large predators.
  • Batoidea 鳐总目,又名魔鬼鱼;Rajiformes 鳐形目;Ray 鲼;Stingray 魟; 鲼形目=燕魟目; Mobula 蝠鲼
  • Manta ray has the largest brain of fish