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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 ...
Shark migration patterns may be even more complex than in birds, with many sharks covering entire ocean basins. Sharks can be highly social, remaining in large schools. Sometimes more than 100 scalloped hammerheads congregate around seamounts and islands, e.g., in the Gulf of California. [38] Cross-species social hierarchies exist.
Many different species (dolphins, turtles, etc.) are also killed in these programs (because of their use of shark nets and drum lines)—15,135 marine animals were killed in New South Wales' nets between 1950 and 2008, [167] and 84,000 marine animals were killed by Queensland authorities from 1962 to 2015. [169]
In particular, harvesting young sharks before they reproduce severely impacts future populations. Sharks generally reach sexual maturity only after many years and produce few offspring in comparison to other fish species. [9] Conservationists estimate that up to 100 million sharks are killed by commercial and recreational fishing every year.
Bodies of water in which sharks can be found include: Seas: all; Freshwater – some species of shark can live both in seawater and freshwater, and include: Bull shark; River shark; Sandbar shark; Depths: from the surface down to depths of 2,000 metres (6,600 ft). A whale shark in the Georgia Aquarium
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.
Chondrichthyes ( / kɒnˈdrɪkθiiːz /; from Ancient Greek χόνδρος (khóndros) 'cartilage' and ἰχθύς (ikhthús) 'fish') is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or bony fish, which have ...
Depending on the season and how far from shore you may be, there could be between 20 to 40 different shark species you could encounter. However, if you’re only considering what you could come ...