Section 2 Fishes Flashcards
What are the characteristics of most fishes ?
1) they live in water and have fins
2) they obtains oxygen through the water
3) they have a closed circulatory system and 2 chambered heart
4) they have fins which help them swim
5) most have external fertilization , the eggs are fertilized outside the females body ( some like sharks are guppies do have internal fertilization)
6) they have a nervous system
Where do fishes get their oxygen?
Water (water contains oxygen)
What are the major groups of fishes?
Jawless fishes, cartilaginous fishes and bony fishes
How are jawless fishes different from other fishes?
They have no jaws and no scales
What are the types of jawless fishes that exist today?
Hagfishes and lampreys
What material makes up the the skeleton of jawless fishes?
Cartilage
What do cartilaginous have?
Jaws, scales and skeletons made of cartilage
What are some types of cartilaginous fishes?
Sharks, rays , skates
Most familiar type of fishes such as trout, tuna and goldfish are what type?
Bony fishes
What do bony fishes have?
Jaws, scales , a pocket on each side of the head that holds gills and a skeleton made of hard bones
What is the function of fins?
Help the fish to stay upright in the water
What is the function the swim bladder organ in a bony fish?
Helps the fish stay stable at different depths in the water
Why do fishes have gills?
So they can breathe underwater
Fish that have a jaws and a skeleton made of cartilage is which group of fish?
Cartilaginous
Which type of fish make up 95 percent of all fish?
bony fishes
