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Welcome to the shark portal! Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the Batoidea (rays and kin).
A 5-metre-long (16 ft) basking shark has been calculated to filter up to 500 short tons (450 t) of water per hour swimming at an observed speed of 0.85 metres per second (3.1 km/h; 1.9 mph). [32] Basking sharks are not indiscriminate feeders on zooplankton.
Great white sharks can swim at speeds of 25 km/h (16 mph) [9] for short bursts and to depths of 1,200 m (3,900 ft). [10] The great white shark is arguably the world's largest-known extant macropredatory fish, and is one of the primary predators of marine mammals, such as pinnipeds and dolphins.
A Bay Area photographer captures juvenile white sharks "smiling" in the warm waters of Monterey Bay.
This video was filmed in Lucky Bay near Esperance, Australia. The film crew was making a documentary about sharks and had a tip that a great white might be swimming around in the waters.
Drone footage shows a number of great white sharks swimming around surfers at a California beach. The footage was captured at San Onofre beach, San Diego, by photographer Kevin Christopherson and ...
Shark Anatomy (50693674756) The gill slits of a whale shark flaring as it expels water from its pharyngeal cavity. In the shark anatomy image, it depicts the beginning half of the shark, including the gills. The shark gills are especially important and were evolved from the chordate pharyngeal gill slits synapomorphy.
This works as an outer skeleton, providing attachment for their swimming muscles and thus saving energy. [33] Their dermal teeth give them hydrodynamic advantages as they reduce turbulence when swimming. [34] Some species of shark have pigmented denticles that form complex patterns like spots (e.g. Zebra shark) and stripes (e.g. Tiger shark).