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The growth rate for milk sharks off Chennai have been calculated as 10 cm (3.9 in) in the first year, 9 cm (3.5 in) in the second year, 7 cm (2.8 in) in the third year, 6 cm (2.4 in) in the fourth year, 5 cm (2.0 in) in the fifth year, and 3–4 cm (1.2–1.6 in) per year from then on. [23]
Once the baby sharks are born, they are not taken care of by the parents in any way. Usually, a litter consists of 12 to 15 pups, except for the great hammerhead, which gives birth to litters of 20 to 40 pups. These baby sharks huddle together and swim toward warmer water until they are old and large enough to survive on their own. [18]
English: The size and growth of the whale shark (Rhincodon typus), represented by various individuals reported in the literature.A small 55 centimetres (22 in) pup, a 5.62 metres (18.4 ft) juvenile, a generic 9 metres (30 ft) young adult, a large 12.1 metres (40 ft) adult, and an exceptionally large adult with a precaudal length of 15 metres (49 ft).
The size at birth has been reported to be 61–80 cm (2.00–2.62 ft), though observations of free-swimming juveniles as small as 57 cm (1.87 ft) long in the eastern Pacific suggest that birth size varies geographically. [14] Juvenile sharks remain in shallow water to avoid predation by larger adults. [4]
The furthest west a white shark has been spotted in the Gulf of Mexico, researchers report a great white shark named LeeBeth has made history. Great white shark makes history after being spotted ...
A mysterious shark that may count as the world’s largest predatory fish appears to be in decline off the U.S., ... but a 35-year-old female studied by scientists proved to be immature ...
During a 30-year period, more than 33,000 sharks have been killed in KwaZulu-Natal's shark-killing program—during the same 30-year period, 2,211 turtles, 8,448 rays, and 2,310 dolphins were killed in KwaZulu-Natal. [160] Authorities on the French island of Réunion kill about 100 sharks per year. [161]
Previous best guesses estimated that the shark's demise happened about 1.5 million years back. Now researchers are saying it took place closer to two-and-a-half million years ago.