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Shark. † Synechodontiformes. 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[1] (or Selachii) and are the sister group to the Batoidea (rays and kin).
[75] [77] Competition between orcas and white sharks is probable in regions where their diets overlap. [78] The arrival of orcas in an area can cause white sharks to flee and forage elsewhere. [79] [80] Orcas appear to target the liver of sharks. [75] [77] In one case a single orca was observed killing and eating a great white shark on its own ...
The tiger shark (Galeocerdo cuvier) [ 3 ] is a species of ground shark, and the only extant member of the genus Galeocerdo and family Galeocerdonidae. It is a large macropredator, with females capable of attaining a length of over 5 m (16 ft 5 in). [ 4 ] Populations are found in many tropical and temperate waters, especially around central ...
Shark anatomy differs from that of bony fish in a variety of ways. Variation observed within shark anatomy is a potential result of speciation and habitat variation.
A fish (pl.: fish or fishes) is an aquatic, anamniotic, gill-bearing vertebrate animal with swimming fins and a hard skull, but lacking limbs with digits.Fish can be grouped into the more basal jawless fish and the more common jawed fish, the latter including all living cartilaginous and bony fish, as well as the extinct placoderms and acanthodians.
The first shark-like chondrichthyans appeared in the oceans 400 million years ago, [1] developing into the crown group of sharks by the Early Jurassic. [2] Listed below are extant species of shark. Sharks are spread across 512 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in ...
The whale shark is a filter feeder – one of only three known filter-feeding shark species (along with the basking shark and the megamouth shark). It feeds on plankton including copepods, krill, fish eggs, Christmas Island red crab larvae [62] and small nektonic life, such as small squid or fish.
Whale shark: The largest fish is the whale shark. It is a slow-moving, filter-feeding shark with a maximum published length of 20 m (66 ft) and a maximum weight of 34 tonnes (33 long tons; 37 short tons). Whale sharks can live up to 70 years [63] and are a vulnerable fish. Ocean sunfish: The ocean sunfish is the heaviest bony fish. It can weigh ...