SARASOTA FINS 2015 wwwsarasotafinsweeblycom NOT ALL SHARKS HAVE BABIES THE SAME WAY How to tell female vs male shark apart Males have claspers circled in red ID: 467032
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SHARK MATING & REPRODUCTION
SARASOTA FINS © 2015
www.sarasotafins.weebly.comSlide2
NOT ALL SHARKS HAVE BABIES THE SAME WAY.Slide3
How to tell female vs male shark apart:Males have claspers (circled in red).
Females do not.Slide4
Male sharks will hold onto a female shark by biting onto the female and holding her still. He will then insert a clasper (one at a time) into her to mate.Slide5
Some sharks, like this Port Jackson shark, release their fertilized eggs into the sea, leaving them unguarded. This is called oviparity.Slide6
The eggs are protected inside a tough, leathery egg case.
That’s a real shark baby!Slide7
Some sharks, like the lemon sharks, practice viviparity.
The developing pups have a placental link to the mother and
then the pups are born live.Slide8
Other sharks, like cookie-cutter sharks, practice ovoviviparity.
They keep their babies inside. They get extra nourishment from eating eggs and their smaller siblings!Slide9
Some sharks are also capable of parthenogenesis.
When a female can have babies without a male’s help (sperm).Slide10
Different animals go through different maturation rates.Slide11
Elephants and people take many years to mature, reproduce, and die.
Fruit flies can hatch, mature, reproduce, and die in a matter of days. Slide12
Sharks tend to be more like elephants than flies.Slide13
Most shark species grow slowly and mature late.
In
fact, dusky sharks don’t reach their breeding age until they are more than 20 years old. Slide14
Many shark species reproduce only every other year. Some sharks carry their young for two years. And many produce only a small number of young at a time.Slide15
HOW DO YOU THINK THIS AFFECTS THEIR POPULATIONS?