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The dusky shark (Carcharhinus obscurus) is a species of requiem shark, in the family Carcharhinidae, occurring in tropical and warm-temperate continental seas worldwide.A generalist apex predator, the dusky shark can be found from the coast to the outer continental shelf and adjacent pelagic waters, and has been recorded from a depth of 400 m (1,300 ft).
Many sharks can contract and dilate their pupils, like humans, something no teleost fish can do. Sharks have eyelids, but they do not blink because the surrounding water cleans their eyes. To protect their eyes some species have nictitating membranes. This membrane covers the eyes while hunting and when the shark is being attacked.
Under normal circumstances, horn sharks are harmless to humans and can readily be approached underwater. [3] However, they can be provoked into biting, and some pugnacious individuals have been known to chase and bite divers after being harassed. [6] These sharks should be handled with care as their fin spines can inflict a painful wound. [3]
In the video, the kayaker can be seen being stalked by a great white shark off the coast of Northland, New Zealand.
In fact, at SeaWorld Orlando, kids can touch a shark, learn about different species of shark and even dine at a restaurant where sharks swim past throughout their meal.
Shark research is hard to get funding for, in part, because sharks aren’t a commercial species. Yet the irony is that they affect commercial species, namely fish populations.
These parasites can cause several damages to the sharks' eyes, such as ulceration, mineralization, and oedema of the cornea, leading to almost complete blindness [11]. This does not seem to reduce the life expectancy or predatory ability of Greenland sharks, due to their strong reliance on smell and hearing. [16] [18]
Sharks could be facing extinction over the next couple of decades. Human interference is largely to blame for the species interference. Overfishing of sharks has increased as the global demand has ...