Do you know that…

Tiger sharks (Galeocerdo cuvier):
– have teeth shaped like those found on a circular saw?
– can travel thousands of miles between continents ?
– can have between 10 & 82 pups ?
– require bays or estuaries as nursery aeras ?
– can take up to 18 years to reach maturity ?
 
Basking sharks (Cetorhinus maximus) :
– are long distance travellers ?
– filter around 2000 tons of water a day?
– can weight up to  1800 kgs ?
– are the second largest fish in the sea ?
– swim by moving their entire body from side to side, not just their tail ?
– spend a lot of their time at the surface, hence their nickname (confusingly) is “sunfish” ?
– have hundreds of tiny ineffective teeth ?
 
Tresher sharks (Alopias sp.):
– have tails so large they account for more than a third of their body weight and half of their total length?
– are solitary and are rarely seen near the shore ?
– use their tails to herd prey, and even to stun sardines or mackerels ?
– can leap out of the water if threatened or provoked?
– are ovoviviparous (eggs develop and hatch in the uterus, and continue to develop until birth) and have young that can feed on weaker siblings in the womb – known as intra-uterine cannibalism ?
– have very big eyes to help to see in the dark ?
 
Great white sharks (Carcharodon carcharias):
– females are generally larger than males ?
– males reach maturity at 3.5–4.0 meters (11–13 ft), and females at 4.5–5.0 meters (15–16 ft) ?
– have an average mass of 680–1,100 kgs (1,500–2,400 lb) ?
– reach sexual maturity at around 12-15 years of age?
– have an gestation period about 11 months ?
– are ovoviparous and that the shark’s pup’s powerful jaws begin to develop in the first month?
– are now considered endangered as no accurate population numbers are available?  Sharks taken during the long interval between birth and sexual maturity never reproduce, preventing population recovery.