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MYTH VS. FACT. http://www.youtube.com/watch?v=kbD-jb- ovOo. Usually a shark preys on humans?. No, most are scared of humans. Hammerheads are very large, but usually nice to humans. Bubbles from divers tanks initiate sharks attacks?.

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slide1

MYTH VS. FACT

http://www.youtube.com/watch?v=kbD-jb-ovOo

usually a shark preys on humans
Usually a shark preys on humans?

No, most are scared of humans. Hammerheads are very large, but usually nice to humans.

sharks can t go in fresh water because
Sharks can’t go in fresh water because…?

There is no salt

They can breathe

Other

why do sharks migrate can have more than one answer
Why do sharks migrate? Can have more than one answer…

Follow prey

Reproduce

Safety

Different temperature of water

They don’t migrate

sharks live in what temp and depth
Sharks live in what temp and depth?

Deep water

Cold water

Warm water

Shallow water

All of the above

which method of fishing has the highest bycatch of sharks choose all that apply
Which method of fishing has the highest bycatch of sharks? Choose all that apply

Shark finning

Gillnets & longlines

Bottom trawl

All of the above

which class do sharks chimaeras and batoids belong to
Which class do sharks, chimaeras and batoids belong to?

Cartilaginous

Osteichthyes

Cretaceous

Crustaceans

slide14
In Costa Rica there are sharks that can walk on land and survive without salt water for more than 3 hours?

http://books.google.co.cr/books?id=NfQDAAAAMBAJ&pg=PA26&dq=sharks+in+costa+rica&hl=en&sa=X&ei=Xtd8U4aNH5WssQT60YHQDw&redir_esc=y#v=onepage&q=sharks%20in%20costa%20rica&f=false

sharks have terrible eyesight
Sharks have terrible eyesight?

Sharks have great eyesight.

Hammerhead sharks Sensory Organ:

Eyes on edge of head

Ampullae of Lorenzini: electric fields

Helps find sting rays- diet carnivore

http://animals.nationalgeographic.com/animals/fish/hammerhead-shark

sharks stay very close to their babies once hatched
Sharks stay very close to their babies once hatched?

False, They leave their babies to fend for themsevles.

Hammerhead Sharks Reproduction:

Females: 20-40 pups at a time

Separate from young quickly

Survive b/c they are feared

sharks only detect prey through smell and sight
Sharks only detect prey through smell and sight?

They detect prey through electrical charges.

great white sharks can grow larger than boats
Great white sharks can grow larger than boats?

http://www.sharks-world.com/great_white_shark_video/