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Sharks

Oceanography Shark Unit

QuestionAnswer
Are sharks considered fish? Yes, all Class Chondrichthyes are fish
What does Chondrichthyes mean? Cartellagenous Fish
Is there more salt in the ocean or in a fish? the ocean. Fish use osmoregulation to eliminate salt from their body.
Are shark attacks common or rare? Rare - fewer than 100 per year
Do sharks have a swim bladder? No, they use the oil in their liver to adjust for depth.
Can sharks stop and rest? Many can stay still - if they have the spiracle. Others must keep moving.
How long is the smallest shark? (the pygmy) 9 inches long
What shark is most dangerous to humans? Great White Shark
How many shark species are there? 360 species
What is a shark's skeleton made of? Cartilage
What is the world's largest fish? Whale Shark
Evidence for sharks goes back how many years? 450 million years
What shark can move between fresh and salt waters? Bull Shark
What is another name for Caudal fin? Tailfin
What are claspers used for? Mating
Where is the fin spine located? In front of the First Dorsal Fin
Created by: tejneckyc
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